To be honest, I used to loathe Valentine's day with it's overpriced roses and tacky pink and red color scheme. But now that I have little children, Valentine's day is fun again. C is in kindergarten this year and needed to bring 32 valentines to school, so we needed something relatively quick and easy. I always try to think of some way to involve the kids, either by including their drawings or having them help with the assembly.
For this years cards, I printed out plain red hearts with white circles for eyes. I made a sample for the kids showing them how to draw the face and arms and legs. Then the kids took black pens and made their own. Attach some candy to one or both of the hands and you're all set. Here is a template you can download.