Have you already seen the Thermaltake Mozart TX. There are a couple of threads on it here already. It's a bit out of the typical mold. Pretty much all of the practical designs have been thought of already. It'll take a sea change on the internal components to allow much change in the skins. Form follows function doncha know...
Oh, and I forgot the XClio A380 - see it at Newegg. Factory page link there too.
.bh.