I finished illustrating a book on British humour a couple of months ago (I might upload some illustrations later) and the author was open to suggestions of quintessentially British things to put on the cover and we ended up agreeing on a globe of London with the famous detective duo stomping all over it.
This was fun!
Link
Zombimatic
Immediatly reconized the guy on the thumbnail!
Really cute - could work just fine on a postcard!