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Excel is like most other applications in that it uses the color scheme indicated in your system preferences. To change it in Windows, go to your display properties (either click on "diplay" in your control panel or just right click on an empty part of your desktop wallpaper and choose "properties"). Select the appearances tab. Depending on your version of Windows, you may have an "advanced" button on this tab which you should click. In the "item" drop down menu, choose "selected," and then you can pick the color you want to use. Click "OK" to get out of the advanced properties (if you have them) and then "apply" and "OK."
I’m not a mac person, but I did find this article that explains where your display properties can be modified if you’ve got a mac with OS X.
Realize, though, that if you change this to get the color you want in Excel, it’ll change your other applications as well. It might take some playing around until you find one that’s suitable for everything.
Hope this helps!
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