ok here is my idea BUT i haven't tested it, So if anyone knows wether this will work or not please send me a private message.
My arts and crafts store had crayola model magic on sale on MLKday so i bought a few bags. my idea was to have the kids form it into a ball then squish it into a heart shape, use a dowel rod or pencil or straw and poke a hole in it then string it on a pre- cut ribbon. If the model magic will hold an impression i might even bring in objects that they could press into it. Anyhow the kids would end up taking home a heart necklace. My concerns are i don't know how easy the stuff is to work with, can Kindgarteners make a heart out of it, and even if it takes a while to dry will it be ok to stick in back packs?
This is something else i think is cute. take the hard plastic clear acrylic picture frames with the magents on the back that you are suppose to put on the fridge and give them small stickers to decorate the edges with to create a "frame" and the slip a Kissy Face picture of them in it to give to a loved one.
Good luck! and if anyone knows about the model magic please let me know. thanks