Recently, a thread on some of the Yahoo groups has been about circular shawl patterns. I've found very few free ones on the web. They are sometimes labeled doilies, tablecloths, Pi shawls, baby shawls or blankets, etc. They all look like they could be made as shawls.
Circular Shawl (click on picture to get the pattern)
Knitted Lace Doily
Old Shale Tablecloth
Queen Anne's Lace
If you know of any other free circular shawl patterns for these, let me know.