Our friend Dev Parikh of Hack MSN Spaces (congrats on the MVP award, Dev, well deserved!), along with Little Fish Big Pond, have put together a nice set of backgrounds for individual blog posts that you can download, add in the html, and customize your Spaces on a per post basis.
Quite a nice set of background images, especially if you’re into fantasy:
Just for fun, we created an entry over on our LiveSide Spaces site. Nice work, guys!