The Museum of Contemporary Art has free Mondays (11-5 pm) and Thursdays (5-8 pm) thanks to street artist Banksy. The exhibit, Art in the Streets, is located at the Geffen Contemporary and features all kinds of street art. If you are in the Los Angeles area, you should definitely check it out while it's around. Hurry up though, the exhibit's last day is August 8. Anyway, here are some photos from my visit.
There is a slide show with a total of 44 photos at the end, so be sure to check that out too! The slideshow feature seems to be a bit buggy. I'm going to replace it with a gallery.