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The Rams have positioned themselves nicely in free agency and the draft so far, thus allowing themselves a "luxury pick." The Rams still have needs everywhere, and while this pick would fill some of those needs, this is more about adding another weapon than filling another need.
Chris Rainey is 5'8", 174 pounds, and runs a 4.38 in the 40-yard dash. He is a "slippery" type of player, able to elude defenders and cut on a dime. Rainey is one of those little scat backs you play with on Madden. You know, the kind that can take it to the house on any given play?
Rainey is that dude in real life.
I could see the Rams using Rainey in the return game right away, while also using him as a change of pace back and/or slot receiver. For a team starved of playmakers, Rainey would make the opposing defense at least respect whatever side of the field he lines up on.
Other Possibilities: Robert Turbin (RB, Utah State), Cyrus Gray (RB, Texas A&M), Jamell Fleming (CB, Oklahoma)