This is one of those great kill-two-birds-with-one-stone projects. Got lots of old towels kicking around that are too ratty to donate but you don't want to dump them in the landfill? Got a child (or better yet, children) with busy little fingers? Have we got the perfect rainy day activity for you.
We spotted this fabulous little how-to on Ecologue by way of Cookie's Nesting blog a few months back, and we bookmarked it in anticipation of Kitchens and Bathrooms Month. All you need is a bunch of old towels (old t-shirts will also do) and gridded matting that you should be able to find at most craft stores.
The instructions are pretty straightforward. Read them in their entirety -- and watch a helpful video -- at Ecologue.