Some simple but elegant looking cases are those of the Corsair Carbide series. (Although, if you wanna go all out, there are the 650D, 800D, 550D, 600T.)
There are the HAF cases from CoolerMaster, I suggest the HAF X/XM.
Antec also makes good cases, but they are VERY simple, they are loaded with features although. Some are the 302, 902.
Silverstone make some good cases, but I know nothing of their models lol.
For the lolz, take a look at some Asus cases. XD (they dont compare to those I just mentioned, some look quite funny though lol.) Check this one out: http://www.cdrinfo.com/forum/upfiles/17750/13475F4DD7F54BE7BFF9A85ECB0C1993.jpg
(I got it from the Toms Hardware Members System Gallery in the Homebuilt section)