Now that is cool! 
Wish I had the idea first 
I did.
They are at
http://www.cafepress.com/ahua/1218383. But give us a break: the design comes first, then the question of what products to put it on. So when thongs (and boxers) are among the possible products I can put "Jack Nasty!" on, my reaction is "Hell yes! Why not?"
I've moved on to exploiting other movies now, you may be pleased to hear.
I have a line of products saying "
WHAT WOULD SILAS DO?" with a cilice underneath at
http://www.cafepress.com/wero/1467257 (These are modelled on my "
WHAT WOULD JUDAS DO?" with 30 pieces of silver at
http://www.cafepress.com/wero/1440321, one of a line of atheist and agnostic products at
http://www.cafepress.com/wero/1440313).
And, perhaps of more interest to Brokies, "
They wish to cure us but I say we are the cure" (said by Sir Ian as Magneto in
X-Men 3) on a rainbow, or, more discreetly, in rainbow-coloured letters, at
http://www.cafepress.com/wero/1470381
