otheila,
Your idea is something that has been in the back of my mind right from the beginning. Everytime I run into a craft shop to look for the hearts I have also been watching for large styrofoam sheets, hoping to do just what you suggest. Unfortunately the sheets are not wide enough, but I never thought of Home Depot or places like that. Thank you so much. I am in love with this idea and I will run over there today and see what I can find!
Thanks also to everyone who posted here. Your ideas have been super and I will keep them all in mind. I will definitely remember the cemetary idea and I've jotted down the phone number for Good Scents. I'm also going to try and get my daughter to check out the Ben Franklin in Traverse City.