The Lions just drafted TCU running back Aaron Brown with the 192nd pick of the draft. Here is some info on Brown from NFL.com:
An all-around threat for four seasons at TCU, Brown hopes to bring that versatility to the NFL. He started his career as Mountain West Freshman of the Year and Freshman All-American, and added a second-team nod in 2006 before suffering through an injury-filled junior season. He bounced back a bit as a senior, although his numbers weren't great (547 yards on only 99 carries; 95 yards on 12 receptions) because TCU's offense spreads the ball around. Brown's receiver build may turn off some teams, but his potential as a kick returner (29.2 average, 1 touchdown) will gain him points with others.
At this point the Lions are taking a chance on someone who has had injury problems during his college career, which is likely why he is a sixth-round pick. There's no real reason not to take risks by this time in the second day, but I still don't get why the offensive line is getting ignored. There are still three more picks, though, so hopefully at least one OL will be picked before the day is over.