2+ players. You'll need some paper and whatever art materials you've got to hand - pencils, pens, markers, whatever.
Art Deck is a card game that gets players drawing on one shared sheet of paper, following the instructions on the cards and taking turns to add to a growing artwork until someone decides that it's finished, and signs their name. Players change the instructions as the game proceeds, acting within a framework that encourages them to experiment with their materials and use them in new ways, freeing them up from the pressure that some people feel when confronted with a blank page.
Art Deck Online is part of an ongoing project by Holly and Matheson Marcault with Alex Parrott.