Played with fabric paint a little while back and created a lemming shirt! Alas i haven't been able to rescue the little builder from the bf for long enough to get a decent photo. Fortunately a second lemming appeared,a floater this time, and stuck around long enough to be photographed.
Here he is:
And a gremlin shirt soon followed. This little guy is based on David Booths' goblin minion over at Dungeon Mastering. The shiny bits are because he's still a bit wet in the photo, he dried to a more matt black and the chalk marks behind have since disappeared.