Once Wed has a DIY tutorial posted on how to make these pretty heart sticks shown below.
Playing with Brushes has a lot of romantic looking backgrounds available that would be perfect for making Valentine's Day cards. See one below.
Danielle Thompson shows how she made the cute Valentine cards shown below using rejected instant photos here. See one photo below.
There are free valentine printable flashcards, designed by Rachel Hall, available from A Million Memories here.