A Linux Quilt is a T-shirt quilt made from Linux T-shirts, of course...
It's also the answer to the age-old question:
What am I going to do with all those Linux T-shirts? I can't wear them all!
Below is a picture of the first LinuxQuilt. Unfortunately AlanRobertson has so many T-shirts, they won't fit into a single quilt. But, this is a good start.