Colts attended Toledo's RB David Fluellen's pro day: http://blogs.nfl.com/2014/03/12/toledos-david-fluellen-gets-close-look-from-colts/
18 representatives were there at his pro day. Here's what they say about him for those of you who don't know who he is: "Fluellen — a two-time first-team All-MAC selection — is a good running back, but because there are so many good running backs in the 2014 NFL Draft class, some are going to get passed over. If Fluellen is selected, it'll be in the late rounds. Or, he'll be a priority free-agent pickup following the event."
Next up, Colts attended Nevada's O-Lineman Joel Bitonio's pro day. Here's what happened: "The Bengals and Rams coaches worked Bitonio mostly at center on his pro day; the Colts and Chargers coaches worked him out at left tackle and at guard the following day.Bitonio (6-4 1/4, 305 pounds) stood on all of his numbers at the combine and had a very good workout. He'll probably be a second-round pick, some place between the 40th and 50th pick."
All this can be found on Indystar: http://www.indystar.com/story/sports/nfl/colts/2014/03/16/colts-links-vick-ballard-david-fluellen-joel-bitonio/6490835/
Ars of now, along with these two prospects, the Colts have looked at (not including combine), DT Will Sutton, and S Jimmie Ward.