This was posted by Debra Dalgleish:

This should set the default colour for any new books:

1. Create a new, blank workbook.
2. Choose ToolsOptions
3. On the Colour tab, click on the yellow square
4. Click Modify, select a colour as the default, click OK
5. To make yellow available, select the square that has the same colour
as the new default, and change it to yellow
6. Click OK.
7. Choose FileSave As
8. Save as Type: Template
9. FileName: Book
10. Location -- save the file in your XLSTART folder
11. Click Save

Ben wrote:

When opening/launching Excel...
Is there a way to change the Fill color from the yellow (by default) to a
color of my choice (eg, white)?

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Dave Peterson