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:

Looks like it's pretty easy: just go to the Hack MSN Spaces SkyDrive folder, choose a background, download the html and insert it into your blog entry, and enjoy.  The full set of directions are here.

Just for fun, we created an entry over on our LiveSide Spaces site.  Nice work, guys!