My wheels aren't custom but they are very light, Reynolds Stratus DV's and KOM UL's, both tubulars.
At a race a couple of weeks ago I saw a set of wheel that looked very cool. The hubs were massive as where the spokes. He had them laced to red rims, blue spokes and red hubs. I have no idea if they were light or strong but they looked pretty freakn' cool.