Here is a color palette suitable for an Excel sheet background that works well with black text:

 <Excel Background Colors>
1. Light Sky Blue - 
                            
                            #87CEFA
                         - A soft, calm blue that provides a clear backdrop for text.
2. Pale Green - 
                            
                            #98FB98
                         - A fresh green that adds a touch of nature without overpowering.
3. Lavender - 
                            
                            #E6E6FA
                         - A gentle purple that is soothing and easy on the eyes.
4. Light Coral - 
                            
                            #F08080
                         - A warm, inviting coral that offers a friendly vibe.
5. Peach Puff - 
                            
                            #FFDAB9
                         - A soft peach that brings warmth and lightness.
6. Light Yellow - 
                            
                            #FFFFE0
                         - A bright, cheerful yellow that enhances visibility.
7. Honeydew - 
                            
                            #F0FFF0
                         - A very light green that feels refreshing and clean.
8. Lavender Blush - 
                            
                            #FFF0F5
                         - A soft pinkish hue that adds a hint of warmth.
9. Light Salmon - 
                            
                            #FFA07A
                         - A gentle salmon color that is both vibrant and comforting.
10. Mint Cream - 
                            
                            #F5FFFA
                         - A very light mint color that feels cool and refreshing.
11. Light Goldenrod Yellow - 
                            
                            #FAFAD2
                         - A soft yellow with a hint of gold, adds warmth.
12. Thistle - 
                            
                            #D8BFD8
                         - A pale purple that is elegant and subtle.
13. Pale Turquoise - 
                            
                            #AFEEEE
                         - A refreshing pale blue that feels airy and light.
14. Seashell - 
                            
                            #FFF5EE
                         - A very light beige with a hint of pink, offering a neutral base.
15. Light Steel Blue - 
                            
                            #B0C4DE
                         - A cool blue that provides a professional and calm atmosphere.
16. Misty Rose - 
                            
                            #FFE4E1
                         - A soft, gentle pink that creates a warm ambiance.
17. Light Slate Gray - 
                            
                            #778899
                         - A cool, muted gray that adds sophistication.
18. Alice Blue - 
                            
                            #F0F8FF
                         - A very pale blue that is almost white, offering a clean feel.
19. Blanched Almond - 
                            
                            #FFEBCD
                         - A light, warm beige that is inviting and soft.
20. Pale Goldenrod - 
                            
                            #EEE8AA
                         - A soft gold that provides warmth without distraction.
21. Sky Blue - 
                            
                            #87CEEB
                         - A brighter blue that evokes a sense of openness and clarity.
22. Light Pink - 
                            
                            #FFB6C1
                         - A soft pink that adds a playful touch.
23. Light Sea Green - 
                            
                            #20B2AA
                         - A muted teal that is refreshing and calm.
24. Beige - 
                            
                            #F5F5DC
                         - A neutral color that offers a warm, classic background.
25. Powder Blue - 
                            
                            #B0E0E6
                         - A soft blue that feels tranquil and serene.

This palette features light and pastel colors, ensuring that black text stands out clearly while providing a visually pleasing and professional appearance.

Do you have any specific preferences or themes in mind for the colors, or would you like to explore different shades or variations?