This is a pretty creative way to get in some bike miles. Baltimore bicyclist Michael J. Wallace has created illustrations using his GPS mapping device and carefully plotted routes. He has made everything from a hammer to a shark to a giant Angry Birds illustration.
“Think of each of these images as being akin to a giant Etch-a-Sketch. Once the recording begins, a continuous line is drawn,” Wallace says on his website.
This video from Slate gives you an idea of some of his work.