Sure! Here are a few more pastel colors to expand your palette:

 <Pastel Serenity Expanded>
1. Lavender - 
                            
                            #E6E6FA
                         - A soft, light purple that evokes calmness and tranquility.
2. Baby Blue - 
                            
                            #B2DFF7
                         - A gentle, soothing blue reminiscent of clear skies.
3. Mint Green - 
                            
                            #B3E5B3
                         - A pastel green that brings a fresh, nature-inspired feel.
4. Blush Pink - 
                            
                            #F4C2C2
                         - A soft, warm pink that adds a touch of warmth and sweetness.
5. Lilac - 
                            
                            #D8BFD8
                         - A light purple with a hint of pink, conveying a dreamy atmosphere.
6. Powder Blue - 
                            
                            #B0E0E6
                         - A very light blue that is refreshing and airy.
7. Seafoam Green - 
                            
                            #9FE2BF
                         - A soft green that suggests tranquility and natural beauty.
8. Peony Pink - 
                            
                            #F6B2B2
                         - A vibrant yet gentle pink that radiates happiness.
9. Periwinkle - 
                            
                            #CCCCFF
                         - A soft mix of blue and purple that feels playful and serene.
10. Cream - 
                            
                            #FFFDD0
                         - A warm, neutral pastel that balances and softens the palette.

This expanded pastel color palette maintains the theme of natural happiness while providing even more variety for your categories in the spreadsheet.

Do these additional colors fit your vision? Would you like to explore any specific shades further or need assistance with anything else?