My favorite is the HB-option, goes back to when Dan Reeves was playing for us but we have had several guys that could throw it pretty over the years well: Reeves, Calvin Hill, Robert Newhouse, & Ron Springs come to mind.
My all-time favorite was when Ron Springs threw a TD pass to QB Danny White, now that was cool!
I also like the flea-flicker and the fake-punt (which we NEVER run). I've never understood why more teams don't run a fake punt more often. I see so many times when they only need a few yards and the other team is booking down the field to block rather than rushing the punter. He could usually walk for the 1st down but instead he just punts it away. I don't think it would take much for one of his teammates to tell him to run with it.
I loved Novacek or Bjornson running the fake FG.
I hate the reverse and/or double-reverse. It rarely succeeds and usually is stuffed for a loss.