I've made some paintable versions of the buildings found (here in 2-minutes town & city tokens pack). There are also 3 tree brushes using trees from the previously mentioned pack and their roadside forest token pack, and camp tokens.

Install it as you normally would. Everything is a default white colour so any colours you paint with should be vibrant. There's a good selection of things included so I hope this makes people building cities have a bit more variety available as far as aesthetics or just colour coding areas goes.