The the concrete along the banks of the Los Angeles River between Downtown (Union Station) and Elysian Park has some pretty large and elaborate tags. posted by 4easypayments at 11:19 AM on February 18, 2005
Alleyways and side streets on either side of Melrose Ave are excellent -- I took many pictures there last year... posted by fet at 11:50 AM on February 18, 2005
Sorry, should have mentioned -- I have a few of those pictures up -- gallery here. Gives a good idea of the level of the stuff you'll find, which is quite high. The area between Crescent Heights and Vine, IIRC, is the best to find good stuff.
posted by 4easypayments at 11:19 AM on February 18, 2005