I had never heard of these before, but The Quilted Magnolia blog (see the link on the right side of the page here) that I follow talked today about joining a mug rug swap. She had a link to the mug rug swap she joined, but she also had a link to some inspiration on Flickr - The Scrappy Mug Rug Swap. There are some very cool mug rugs to look at.
All of which is to say, maybe a block or two from this blog will end up as a mug rug. I'm also considering using some of them to make table runners for Christmas, but maybe I can use some to make mug rugs too. And then I'll have to learn to free motion quilt. Sigh.