Set up an "artist's studio"

I had an idea to reward students for their great attitude in art which might appeal and wouldn't cost a cent. Set up an "artist's studio" in the corner of the room where they can earn time to be creative. Here they would have extra space, possibly an easel, access to a broader range of materials etc etc...I haven't tried this yet but will shortly!! I think the students would love it, particularly if you have large classes and not much space.