I just found the Underground Velo blog.  There are some great pictures of some rather unique bikes.  Some of them are quite functional (this one looks purpose built for snow) and some are more on the artistic side.  However, the one linked to on Underground Velo called “SaltFats” – originally detailed at RatRodBikes – is an absolute stunner.

Both sites are well worth the look if you are into custom bikes:

http://undergroundvelo.blogspot.com/
http://ratrodbikes.com