Had a bit of an idea to make a t-shirt relating to my PowerBook 12" today:
So, after digging out the t-shirt transfers and with a considerable chunk of ironing help from kitteny_berk, here's the finished result:
Front:

Back:

(This is squarely between the shoulders and is about 4" across)
See further down the thread if you can't see the images.
All work done on Illustrator and a Mac (of course). Although, the iron was running Windows CE
This the original artwork I used for the rear of the shirt.