Multisite Blavatar for each blog

Hello all,

I know that on wordpress.com you can assign a “blavatar” or blog icon to each blog, so that if you own more than one blog, you can see the different icons on the drop down list.

I was wondering if this were possible in a self hosted wordpress multisite set up. I host several sites under one installation, and would love there to be a different icon for each blog in the list. Right now there are just 15 WP logos in the list.

Thoughts? Answers?

Thank you so much!