There are a couple free applique hearts from Lynnie Pinnie in her Hearts & Flowers Applique Set. I just stitched out the one with the flowers outlining the heart a few days ago and enlarged it for my 5x7 hoop.
There are 2 on the Take your Pick page.
check out the design sites given to jerrib a few minutes ago. They have a lovely applique heart but it costs $3;50 i think. :)
Eddy site has some Valentines, you might want to check them out, they're free......might not be what you want? Failing a ready to go design you could always make one....fold 8.5x11" paper length-wise in half, draw one ½ of your Valentine, cut it out & there you hv it, a nice big one *:*