I'd probably look into these:
NFL.com news: Devlin tops list of best available undrafted players
NFL.com news: Devlin tops list of best available undrafted players
National Football League: NFL Draft 2011 - Terrence Toliver
National Football League: NFL Draft 2011 - Ricardo Lockette -I like the comment about him being one of the fastest at 6-2, 211lbs and maybe they could work on his hands and dropping the ball.
National Football League: NFL Draft 2011 - Joe Lefeged -I'm not saying he's great or anything but he was a K/P returner in college and was used to ***block kicks*** we could use that on special teams.