Craftzine has a really simple valentine's day paper heart necklace project using scrapbooking paper and yarn. One cute idea is to stick a secret message or some candy into the pocket.
Disney's family fun has a cute idea for valentines using molds of make your own clay hearts. The instructions are more involved than their usual craft ideas though.
Zakka life has another version of the paper heart necklace using origami hearts and yarn. They even have a template for the cards to affix the necklace to.
Martha Stewart has a cute way of combining candy and valentines using the paper dot candy and construction paper. All you need to do is cut everything into heart shapes and glue them together.