These are brilliant. I noticed one opposite my mum's shop today. It looks like an old western railway station but painted in black with a huge red diamond on it so the pigeons know where their house is.

http://cache.viewimages.com/xc/3156603.jpg?v=1&c=ViewImages&k=2&d=17A4AD9FDB9CF19390335F8FA9CA92A6F546E2743A6ADFC49930FDCFC4C15FBB

Any more splendid doocats you know of?