Yep, it's a list of lists. The pros have posted some mascot lists
SB Nation's most delicious mascots. Yes, they talk about eating the mascots, a clever, albeit a bit disturbing, take on the creepiest, weirdest, etc. lists that usually circulate this time of year.
USA Today ranked the teams by mascot, loosely on how menacing they are. It's a bit sparse on analysis, but does have some good visuals.
This ESPN list talks about the teams, not so much the mascots, but it's a concise primer for your tourney enjoyment.
I suspect that over the next few days we'll find one or two mascot brackets with graphics.