If there isn't already (and let me know if there is), I'd love to see a way to not only use search terms when searching for art, but also to be able to specify specific creative commons licenses, so we don't have to plug away at different art trying to find a specific license.

I'm looking for art I can use commercially, and that seems to be rare, so I'd love to be able to save time by having the search only tell me which art uses cc-by.