The design has been on the merchandise logo page for several years (see <http://www.willamette.edu/~fruehr/logos/PNGs/RealHackers.png>), but several people had asked for it on a black shirt, and CafePress (our arbitrarily-preferred production house) only recently announced availability such shirts.

By way of fair warning, the black shirts are still considered to be "beta" by CafePress: they are more expensive and can only be printed on one-side. 

Nevertheless, I made a black version of the "Haskell Hackers"/monster logo which can be ordered here:

<http://www.cafepress.com/HaskellHackers>

My beta-tester tells me that it washes well, but that it looks more abstract in black than it does in white, specifically that the monster is less recognizable. (Anyone ordering a shirt might want to compare the two design colors; I haven't made a white one available yet, but would be happy to do so upon request.)

  --  Fritz

PS: as always, Haskell.org merchandise is offered on a non-profit basis. A small amount of funds accrue in the account based on link referrals, which we have used to gift shirts to a few Haskell luminaries.

PPS: I wouldn't recommend ordering this design on the new red ("cardinal")-colored shirts.