<Christmas Themed Colors for Spreadsheet and Dropdown> 
1. Header Color - Soft Evergreen - 
                            
                            #A2BFA0
                         - A gentle green that serves as a calming header, ensuring strong contrast for black text.
2. Alternating Row Color 1 - Muted Crimson - 
                            
                            #D97C7C
                         - A soft, muted red that provides festive warmth while remaining easy on the eyes.
3. Alternating Row Color 2 - Light Mint - 
                            
                            #D1EEDD
                         - A subtle mint green that complements the red and enhances readability.
4. Dropdown Color 1 - Festive Red - 
                            
                            #C72A2A
                         - A classic Christmas red that stands out for important selections.
5. Dropdown Color 2 - Deep Forest Green - 
                            
                            #2F6D26
                         - A rich green that offers a strong contrast for clarity and visibility in dropdown options.
6. Dropdown Color 3 - Soft Gold - 
                            
                            #E8B54D
                         - A warm gold that adds a touch of elegance and festivity to your dropdown menu.
7. Dropdown Color 4 - Winterberry - 
                            
                            #8D4D6B
                         - A muted berry color that adds diversity and warmth, complementing the other dropdown colors. 

This color palette provides a festive Christmas theme with an emphasis on readability for black text and hyperlinks. The alternating colors offer a soft yet engaging look for your spreadsheet, while the dropdown colors maintain a cohesive and colorful selection for user interaction.

Would you like to see more variations, or do you have any specific design elements in mind for the spreadsheet or dropdown?