One of the things that's made Flickr so successful has been the number of toys that people have built using it. Plugging into your account, taking your pictures and messing about with them is a doddle.
The best around, as far as I'm concerned, is FD's Flickr Toys, which lets you do all sorts of things, but today, thanks to a friend, I saw Dumpr, which has a fun little tool that lets you show off your pictures in museum surroundings.
Here's a mirrorshot of me in Moscow last year, and given my horrific camera skills, Dumpr is clearly the closest I'll ever get to having my photography in an art gallery.
Sorry to subject you to that.
Any other fun Flickr mashups out there?