There's something wonderfully creepy and other about circus and magic show posters. The color, the stiff poses, the sometimes fantastical and downright bizarre tableaus. The circusmuseum site, in the Netherlands, isn't in English but you can still sample an excellent presentation of historic circus and sideshow posters from all over the world.
I like the keen-o spotlight you use to select the genre of poster you want to see. All posters available for purchase but not sure I'd actually want any in a room where I need to relax.