Here is a color palette based on the theme of blue, featuring a variety of shades:

json
{
  "palette_name": "Shades of Blue",
  "colors": [
    {"name": "Sky Blue", "hex_code": "
                            
                            #87CEEB
                        "},
    {"name": "Royal Blue", "hex_code": "
                            
                            #4169E1
                        "},
    {"name": "Dodger Blue", "hex_code": "
                            
                            #1E90FF
                        "},
    {"name": "Steel Blue", "hex_code": "
                            
                            #4682B4
                        "},
    {"name": "Light Blue", "hex_code": "
                            
                            #ADD8E6
                        "},
    {"name": "Medium Blue", "hex_code": "
                            
                            #0000CD
                        "},
    {"name": "Cornflower Blue", "hex_code": "
                            
                            #6495ED
                        "},
    {"name": "Deep Sky Blue", "hex_code": "
                            
                            #00BFFF
                        "},
    {"name": "Navy Blue", "hex_code": "
                            
                            #000080
                        "},
    {"name": "Cyan", "hex_code": "
                            
                            #00FFFF
                        "},
    {"name": "Azure", "hex_code": "
                            
                            #F0FFFF
                        "},
    {"name": "Light Sky Blue", "hex_code": "
                            
                            #87CEFA
                        "},
    {"name": "Powder Blue", "hex_code": "
                            
                            #B0E0E6
                        "},
    {"name": "Medium Slate Blue", "hex_code": "
                            
                            #7B68EE
                        "},
    {"name": "Slate Blue", "hex_code": "
                            
                            #6A5ACD
                        "},
    {"name": "Dark Slate Blue", "hex_code": "
                            
                            #483D8B
                        "},
    {"name": "Ice Blue", "hex_code": "
                            
                            #99CCFF
                        "},
    {"name": "Periwinkle", "hex_code": "
                            
                            #CCCCFF
                        "},
    {"name": "Light Steel Blue", "hex_code": "
                            
                            #B0C4DE
                        "},
    {"name": "Electric Blue", "hex_code": "
                            
                            #7DF9FF
                        "},
    {"name": "Blue Violet", "hex_code": "
                            
                            #8A2BE2
                        "},
    {"name": "Steel Teal", "hex_code": "
                            
                            #5F8A8D
                        "},
    {"name": "Dark Turquoise", "hex_code": "
                            
                            #00CED1
                        "},
    {"name": "Light Cyan", "hex_code": "
                            
                            #E0FFFF
                        "},
    {"name": "Teal", "hex_code": "
                            
                            #008080
                        "},
    {"name": "Turquoise", "hex_code": "
                            
                            #40E0D0
                        "},
    {"name": "Medium Turquoise", "hex_code": "
                            
                            #48D1CC
                        "},
    {"name": "Dark Blue", "hex_code": "
                            
                            #00008B
                        "},
    {"name": "Light Blue", "hex_code": "
                            
                            #ADD8E6
                        "},
    {"name": "Cobalt Blue", "hex_code": "
                            
                            #0047AB
                        "},
    {"name": "Blue Green", "hex_code": "
                            
                            #00B2A9
                        "},
    {"name": "Celestial Blue", "hex_code": "
                            
                            #7FB3D5
                        "},
    {"name": "Bright Blue", "hex_code": "
                            
                            #007FFF
                        "},
    {"name": "Dusk Blue", "hex_code": "
                            
                            #5C7F9C
                        "},
    {"name": "Shadow Blue", "hex_code": "
                            
                            #6A7B9D
                        "},
    {"name": "Aero Blue", "hex_code": "
                            
                            #C9E2F1
                        "},
    {"name": "Air Superiority Blue", "hex_code": "
                            
                            #72A0B1
                        "},
    {"name": "Vivid Sky Blue", "hex_code": "
                            
                            #00BFFF
                        "},
    {"name": "Rich Blue", "hex_code": "
                            
                            #003DA5
                        "},
    {"name": "Light Azure", "hex_code": "
                            
                            #D4E6F1
                        "},
    {"name": "Cerulean", "hex_code": "
                            
                            #007BA7
                        "},
    {"name": "Beryl Blue", "hex_code": "
                            
                            #A1C6EA
                        "},
    {"name": "Deep Blue", "hex_code": "
                            
                            #003DA5
                        "},
    {"name": "Tiffany Blue", "hex_code": "
                            
                            #81D8D0
                        "},
    {"name": "Bright Navy Blue", "hex_code": "
                            
                            #1F3A3D
                        "},
    {"name": "Yale Blue", "hex_code": "
                            
                            #00356B
                        "},
    {"name": "Iceberg", "hex_code": "
                            
                            #71B3D6
                        "},
    {"name": "Egyptian Blue", "hex_code": "
                            
                            #1034A6
                        "},
    {"name": "Pacific Blue", "hex_code": "
                            
                            #1CA9C9
                        "},
    {"name": "French Blue", "hex_code": "
                            
                            #0072BB
                        "},
    {"name": "Blue Bayoux", "hex_code": "
                            
                            #A8B9D8
                        "},
    {"name": "Blue Charcoal", "hex_code": "
                            
                            #2C3E50
                        "},
    {"name": "Neon Blue", "hex_code": "
                            
                            #1F51FF
                        "},
    {"name": "Blue (Crayola)", "hex_code": "
                            
                            #1F75FE
                        "},
    {"name": "Blue (Munsell)", "hex_code": "
                            
                            #0093B2
                        "},
    {"name": "Blue (Pantone)", "hex_code": "
                            
                            #003DA5
                        "},
    {"name": "Blue Green", "hex_code": "
                            
                            #007BA7
                        "},
    {"name": "Violet Blue", "hex_code": "
                            
                            #8A2BE2
                        "},
    {"name": "Cool Blue", "hex_code": "
                            
                            #A8D8E5
                        "},
    {"name": "Dark Cyan", "hex_code": "
                            
                            #008B8B
                        "},
    {"name": "Pigeon Blue", "hex_code": "
                            
                            #A4C8E1
                        "},
    {"name": "Blue Black", "hex_code": "
                            
                            #101820
                        "},
    {"name": "Cyan Azure", "hex_code": "
                            
                            #4B8DA8
                        "}
  ]
}

This palette includes a wide range of blue shades, from light to dark, each with its unique hue and vibrancy. Do you have a specific use case in mind for this palette, such as design work or branding?