Well, there are a lot of things you can theme a case mod after. Sometimes the crazy functional abilities of a case mod are as important as visual appeal.
I am in the process of fitting a VIA PX10000 into a cd drive case along with a smaller cd drive, microdrive and various components. It doesn't look very cool on the outside, but the fact that you can run a seemingly empty, and unplugged, computer case with only a CD drive is pretty awesome. Generally small motherboards are good for case mods, unless you are just looking for a themed ATX case
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