Here is a pattern for a crocheted heart it is cute glued to a card. You can also make it into a pin.
Ch 2.
ROW 1: 2 sc in 2nd chain from hook-2 sc.
ROW 2: Ch 1, turn, 2 sc in each sc across-4 sc.
ROW 3: Ch 1, turn, sc in first 2 sc, 2 sc in next sc, sc in last sc-5 sc
ROW 4: Ch 1, turn, sc in first sc, 4 dc in next sc, sl st in next sc, 4 dc in next sc, sc in next sc-11 st
Do not turn, pivotto work around lower edges of heart, work sc evenly spaced around lower edges of heart, working 2 sc in lower point; join with sl st in first sc of Row 4.
There are other fun patterns at
http://belladia.typepad.com/bella_dia/2008/02/sweet-heart-cro.html
http://www.crochetmemories.com/archive/february3.html
http://crochet4you1.tripod.com/valentine_card.htm
http://www.bellaonline.com/articles/art12700.asp
