So, quick announcement: I just opened a public domain graphic archive. There are about a 100 free backgrounds up there right now.
You can also check out my main Flickr Account for Lots and Lots and Lots of Free to use (Attribution required) graphics.
More will be added monthly. Click the images to see the galleries.
If you’d like to know exactly when new stuff is live in there, you can join my Facebook Group, Empowered Creative Women: Live the Life You Want.