There is a FA who just became available I'd love to see the Lions take a look at since they lost out on Moran Norris when the 49ers made a better offer: Mike Karney.
He is more of a pure blocking back, but the Lions need one of those. Felton, if given a chance, could be a good short yardage runner/blocker/catch out of the backfield type FB for the Lions as he blocks well. But for a bruising, jumbo-package blocker Karney would be perfect for Detroit.
The Lions have K. Smith starting, Morris is a solid backup/breather type back, and Felton could be used as a good 3rd down/short yardage back. What the Lions lack is a punishing blocking back, and Karney would fit the bill nicely. By the way, unconfirmed, but I read in one source that he was cut the day before his wedding. Ouch.
Supposed to be a great effort, team oriented, Sledge-type player. Go get him Lions -- if the Price is Right.