I know what you mean. Nothing worse than wandering into a cemetery and seeing graffiti and graves knocked over. Like you said that is a whole other thing and shouldn't even be compared to real quality art like that can be found in Downtown Chiang Mai.

In fact I just found a Chiang Mai Street Art Post I made from last year, that somehow did not get posted. I'll put that up next week or something, but here are a few photos. Let me know if you recognize any of these.