Super cute idea for displaying kid art! :) I did this in our great room the kids love to change their work and when they make something they decide if they want to put it up on the wall. For when I have grandchildren. Should just start a new board.
Tutorial: DIY Tissue Paper Pom-Poms this tutorial is pretty good. Use square sheets or tissue for a rounder Pom Pom. Tie the middle with ribbon and tied several on ribbon and hung them for a backdrop. Use thin tissue paper and fluff gently.