Art Bucks for the art classroom: use them like classroom currency, play art games, use as positive reinforcement, trade/barter for supplies, bid on classmates' work! This might be better than the apple tree and MUCH less work.
Simon Says Art.this is such an exciting idea! I can't wait to try it! ("Simon Says draw a blue circle.") Cool to see what different pictures they end up with! Good for a time filler or to reward a class with an art game party.