Paint

Paint is a possible new piece of content to be added to Minecraft in a future update. "We (especially Jens) have added a bunch of new content to Minecraft that we want to get out asap, so there will be a content patch update next week with a whole pile of fun new toys, including a water mob and quite possibly paint if we can figure out how exactly it should work."- from the word of notch, January 03, 2011.