OK here's how you do it, it's not really a hack.
Go to edit style fonts/colors/etc in admin cp. For category background color you should have something like:
#427C94
(my color, hex will differ on yours)
Replace it with:
#427C94" background="{imagesfolder }/catbg.gif
(adjust the file name to your liking, and no space before the }, I did this just so it wouldn't get substituted with vbimages here)
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