In my photobucket account you can find many free blog backgrounds made by me. When you find one that you like, simply save it to your own photobucket account and then use the direct link url in place of *url* below.
I regret having this a bit more difficult than it once was...my bandwidth at photobucket has exceeded it's limits; apparently people like my backgrounds :)
SO - I will continue sharing backgrounds at photobucket, but they will need to be saved and used from your own personal account.