Here are a few guesses for you to work with. I won't give you VCU (11) over UCLA (6), although that is a very popular upset pick by the experts. I think the Bruins will win the game handily.
For what it's worth (and probably not much) take a look at these:
Wisconsin (12) over Florida State (5). I know. The Badgers had terrible stretches this season, but they score well from the perimeter and won't be as affected as some teams by FSU's very strong interior defense. Bo Ryan will have them prepared. Then it's a matter of making shots.
USC (10) over Boston College (7): This might be a fake upset since Las Vegas thinks the Trojans are the better team, but it's an upset in Bracketworld. Southern Cal won the Pac-10 tournament and is on a little roll. BC is the same team that beat North Carolina this season and lost to Harvard. Anything is possible.
Utah State (11) over Marquette (6): I'm probably influenced because I saw Marquette in the Big East tournament and it was an unimpressive outing. Still, Utah State will be nearly at home under the bright lights of Boise and Marquette hasn't been the same since losing point guard Dominic James.
Not as sure about these, but would also consider Western Kentucky (12) over Illinois (5), and Mississippi State (13) over Washington (4). In fact, if that second game weren't in Portland, Ore., an easy trip for the Huskies, not so much for Miss. State, I would have included it.
Not all of these are going to come in. It never works that way. But these are the ones where the matchups look ripe for the upset. Best of luck.