Here is a single color palette using the hex code 
          
          #3A3A59
        and six different shades:

1. Color Name: Midnight Blue
   Hex Code: 
          
          #3A3A59
       
   Description: A deep, rich shade of blue with a hint of purple. This color exudes a sense of mystery and elegance.

2. Color Name: Steel Blue
   Hex Code: 
          
          #52527A
       
   Description: A cooler, muted shade of blue with a touch of gray. This color adds a calming and sophisticated touch to any design.

3. Color Name: Indigo
   Hex Code: 
          
          #6C6C92
       
   Description: A medium-dark shade of blue with a touch of violet. This color brings depth and serenity to your palette.

4. Color Name: Slate
   Hex Code: 
          
          #8F8FBF
       
   Description: A soft, cool shade of grayish-blue. This color adds a touch of neutrality and versatility to the palette.

5. Color Name: Lavender Gray
   Hex Code: 
          
          #B9B9D2
       
   Description: A light, muted shade of grayish-lavender. This color adds a delicate and soothing element to the palette.

6. Color Name: Misty Lilac
   Hex Code: 
          
          #D8D8E5
       
   Description: A pale, soft shade of lilac with a hint of gray. This color brings a gentle and dreamy atmosphere to the palette.

This accessible color palette features various shades of blue, gray, and lavender that work harmoniously together.