This is a very clever little hack I use in math class all the time. During discussion when the TA is returning homework for the fortysomething people in the section, he just plops the stack of papers on the desk at the front of the room.
So if you do your homework on distinctive paper, be it green engineering paper or Hello Kitty, all you have to do is call out "Hey, someone grab the _____ paper for me!" and your homework magically floats out above the giant mass of people around the desk to you. Problem solved.