So I always fill out a couple brackets in my office pool, and this year since I never win, I decided to let the D20 do the work on one of them. I rolled for each game, and chose like this:

If there were at least 15 spots between the team's rankings, the favorite automatically wins.
13-14 spots, underdog wins on a 1
11-12 spots, underdog wins on a 3 or less
9-10 spots, underdog wins on a 5 or less
7-8 spots, underdog wins on a 7 or less
5-6 spots, underdog wins on a 8 or less
3-4 spots, underdog wins on a 9 or less
1-2 spots, underdog wins on a 10 or less

My D20 picked Syracuse, Michigan State, Wisconsin and UMass in the Final 4 (no 1's - eek), with Wisconsin beating Syracuse in the final. Might be a crappy bracket, but sure was a fun way to pick 'em!