Not sure if it is the right place to place this. But if you like to change your avatar on a regular basis or perhaps your sig pictures this may be something for you.
http://www.random-image.net/?
basicly, you make an account and you can make various links. On each different link you can upload multiple images. (no more then 1 mb though) You copy the right image link (for example you have a link named SOTE avatars with 4 uploaded images in it) you paste it in the avatar (or signature bar) and the images will 'roulette' between those three.
Currently my avatar is two different images which display themselves randomly.
It is usefull if you have problems with photobucket, or like to change your avatar on a very regular bases. You can make multiple links so it is an easy copy and paste :) (sorry if my explenation sucks... xD)