The fine folks at United Pixel Workers have produced at Letterpress t-shirt in both light and dark theme variants. If you buy one -- or more -- Letterpress developer Loren Brichter of Atebits will donate his share (about $5) to the Red Cross. Great game. Great shirt. Great cause.
They're only available for the next 4 days, so if you want one, act fast. (I ordered 3).
And if you haven't played Letterpress yet, check out Dave Wiskus' review.
Source: United Pixel Workers