first sewer covers, then waffles. That's two homeruns in a row!
Waffles are squares like the tiles. The Waffle tile could be a golden yellow too. That would be very Jeff Koons-esque. (Jeff Koons made a life-size replica of an inflatable raft out of copper. It was the most popular piece in the MCA-Chicago for a long time.)
I was earlier at a blog of an MIT grad student that had a sort of ceiling fan gadget, two wheels which rotated oppositely. A video link was included. The link to the blog is in my communities; click on Cati's b&w pic to get there.