I linked to one of the Little Red Wagons - I think it's in Anchorage?
Oh, that's right, I forgot about the Alaskan Little Red Wagon. I saw a video of that once. They look like they are having a blast with that thing. I'd love to get in touch with them and ask them down to Houston.
Also, what about
George Barris' work? I would call those artcars, if anything is. (Warning, second link makes noise.)
Without question. George Barris has made some spectacular artcars. There was a Batmobile replica in this years parade in fact. And I've seen several Flinstone's cars. Barris was one of the judges of the Houston artcar parade a couple of years ago.