The <a target=_blank 
href="http://www.nga.gov/exhibitions/2007/johns/index.shtm">special 
exhibit on 
Jasper Johns</a> showed a neat painting: <a target=_blank 
href="http://www.artnet.com/magazineus/features/cone/cone2-16-07_detail.asp?picnum=5"><i>Out 
the Window</i></a>.  Looks Game-clue like, though I'm not sure how it would work.