Melted crayon hearts: A boy in my class a couple years ago gave these as little Valentines made out of melted crayons. He said, "For Crayon Out Loud, Happy Valentine's Day". could also say, "You COLOR my world!" Use silicone cups to melt them in.
Hand-painted rock hearts - One pinner stated: I actually made hearts from flour dough years ago and hand painted them and turned them into refrigerator magnets. I just recently dropped and broke the last one. Time to make more. They're so awesome.