I just had an idea... let me think more about it. But there should be a website or group here or a hashtag something for some "info" (like pics, google-maps, gps-coordinates, or whatever) for free places, like a wall which desperatly needs to get painted, or a good spot where there is still nothing and it´s waiting. Something like that. Have to think more about that, but I think if I have pics in posts like this I will start adding as well a hashtag like #needstobepainted or #sprayme or #placegraffhere. Any suggestions?