Joe's recommendation that we look to the public domain for inspiration made my mind go one place: folk. Both folk music and folk tales are a wonderful source of inspiration, and much of it is in the public domain!

Watch the video for some more ideas, but here's a general list:
- Write your own wording of a folk tale
- Take a folk tale and modernize it or give it a new setting
- Mash up two well-known folk tales (Sondheim, anyone?)
- Record your favorite folk song
- ReRECord a folk song and make it in a new genre
- Turn a folk tale into a song
- Make a folk song into a tale
- Illustrate a folk tale or song
- Post the lyrics of a folk song you want someone else to reRECord

Be smart and do a little research to make sure your folk tale/song is actually traditional and not written by Joan Baez or Neil Gaiman or some such nonsense. Let's take the art of our folks and reRECord.

EDIT: I want to clarify that I am not suggesting we only use strictly "traditional" works. After all, everything was written by somebody. A perfect example is "This Land Is Your Land": Just because we know Woody Guthrie wrote it doesn't make it any less a folk song. It's public domain because he wanted it to be.
This site is a useful tool for finding public domain works: http://www.pdinfo.com/