Marvin,
A couple of screenshots in the attached workbook show you how to change the RGBs to the colours you want.
When you open the workbook, assuming you don't have macros enabled, Excel gives you a security warning. You can then enable macros. If you close the spreadsheet when you re-open Excel again gives you the security warning - therefore it seems to me that when you enable the macros on opening a worksheet it is just for that time for that worksheet. It does not change your overall settings.
I would consult http://office.microsoft.com/ if you want chapter and verse on excel macro security/ trust centres etc. I am not an expert on security!
Most people do not have the Developer tab enabled so will never see the code anyway. You cannot mess the code up from a worksheet level.
Regards
David
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