If your paper is too heavy, just trace the first one onto the second paper, and then cut it out. Now have them place the silhouettes on white paper so that the noses are 1-2 inches apart. Students can move them around until they are satisfied with the design. Glue the silhouettes into place, and cut off all the extra parts that are not on the white paper. Parents could try to find the one that belongs to their child.
Kids love guessing games, and have fun with parents doing the guessing.
I you wanted to, you could cut the straight edges of the silhouettes before you glue them on to the paper. Then leave a border on the outside edges before you glue. This gives it a framed look. Phyl Phyl, I can see why students would like to be in your room. I can't imagine having a weiner roast and horseback ride for my students.