I cut clear contact paper to size, let the kids stick all of the fall goodies on, and stick another piece to the back. Contact paper is extra sticky and as long as there are no leaves or anything too close to the edge, it keeps everything is place nicely and looks great! I like to use the contact paper because it's safe for all of the different ages I have.This is the third year I have done these leaf collages with the kids and they are a hit each year!