It doesn't get much cuter than Me and My Insanity's Lips card. Take cute photos of your kids, photoshop your message, and glue on some tasty chocolate lips for an adorable card. Source: Me and My Insanity
I've made this project for every valentine's day for my infant classroom, now for my own babies. Sticker foam hearts onto paper, cut access paper off, glue on picture and pipe cleaner, add magnetic strip on back.