Some like these cases with the clear top to show off their chips. They're not too easy to find lately, so check here if you are looking for one:
http://www.ebay.com/itm/272014624646?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
http://www.ebay.com/itm/272014624646?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT