Transform any card to art! Cut Christmas trees out of your Christmas cards or baby shower cards into picture for nursery - I love this idea for all cards! I hate throwing them away, and they take up so much file space. I'd do this for wedding cards too!
Monthly picture on one side, text on the other about the month. Take it a step further by taking their picture with the same thing every month so you can see how they've grow and change. Maybe continuation of pregnancy book