<Christmas Themed Colors for Spreadsheet> 
1. Christmas Red - 
                            
                            #FF0000
                         - A vibrant red that evokes the festive spirit of Christmas, perfect for highlighting important data. 
2. Forest Green - 
                            
                            #228B22
                         - A deep green that complements the red while providing a strong contrast for readability against black text. 
3. Snow White - 
                            
                            #FFFFFF
                         - A bright, clean color that enhances clarity and provides a neutral background for data. 
4. Gold - 
                            
                            #FFD700
                         - A luxurious and festive color that can be used sparingly to highlight key information or important fields. 
5. Holly Berry - 
                            
                            #C72C48
                         - A rich berry color that adds a touch of warmth and can be used for alternate rows or sections. 

This Christmas-themed color palette is designed to create a festive atmosphere while ensuring that the black text remains legible. The combination of red and green reflects classic holiday colors, while gold adds a touch of elegance.

Would you like any additional colors or variations? How do you plan to use checkboxes in the spreadsheet?