http://www.nbadraft.net/2010-nba-draft-workout-master-list-expanded The Rockets worked out: Cole Aldrich, James Anderson, Jermaine Beal, Marqus Blakely (2), Jason Bohannon, Wayne Chism, Aubrey Coleman (2), Bryan Davis, Courtney Forton, Paul George, Manny Harris, Darington Hobson, Willie Kemp, Mac Koshwal, Kelvin Lewis, Ashton Mitchell, Tim Ohlbrecht, Daniel Orton, Kevin Palmer, Patrick Patterson, Magnum Rolle, Omar Samhan, Samardo Samuels, Donald Sloan, Deon Thompson, Ben Uzoh, Willie Warren, Michael Washington, Terrico White, Latavious Williams, Elliot Williams, Nic Wise, Jeremy Wise Bold are the ones worthy of the 14 pick. I'm a little surprised they didn't work out Udoh or Cousins, especially since they have been rumored to moving up for Cousins.
I think they might have worked out Udoh. The list might be incomplete. I saw an interview where Udoh mentioned working out for Houston. Don't remember if he HAD worked out for them or was going to do so, in which case it might have been cancelled. But I do think he went through with the workout.