A map of all the graffitti known to the City of Vancouver, courtesy of the fantastic City of Vancouver Open Data Catalogue.
I’m not sure what the difference between the grey-on-yellow and the yellow-on-grey checkmarks is. I guess they need to work on their metadata still.
update: it looks like each dataset in the catalogue actually is associated with a handy metadata page. For example, here’s useful info on the graffiti data, including the fact that the data is updated weekly. Although I still can’t figure out what the difference between grey and yellow boxes is in the Google Maps version above.