http://www.paperpanache.com/
http://www.silverliningsoriginals.com/
http://chasenbach.tripod.com/bqn/Page15BQN.html
http://www.lenzula.com/pattern/free/index.php
These are just some of my favorite paper piecing sites. There are hundreds of others.
You might also check out patterns by Judy Niemeyer. She does some fantastic paper piecing patterns.