You are sure to make some little person smile if you decorate his breakfast or dinner with those lovely little hearts. They are made of FIMO, a type of polymer clay ( here are plenty of ideas for polymer clay projects). I came upon it in a bookstore while searching for some colored clay that I could bake at home. It is quite suitable for making delicate stuff; just shape it and bake at 11o degrees Celsius. It’s too hard for kids to work with, though. While I was making those little hearts, my daughter was playing with salt dough (I had colored it with food dye in the same red color, and we baked it in the oven as well).