I use this at the beginning and end of each school year. Once the students complete them, I put a number at the top and have them number their papers (as many as I have). I then read all their favorites and they guess whose it is. They put their guess next to the number I call out. You might want to put a name bank on the board for them. They LOVE doing this!
At the beginning of the year, they are lucky to get just a few right. But, at the end of the year, they get almost all of them right. It's really amazing, and they have loads of fun with it!