Use photo stick squares to attach a photo of your kiddo onto card stock. Give your card a more creative look by placing the photo off center, or by putting a border on the photo.
Have your child draw inside the card, sign their name at the bottom, and send it!
This idea works really great for pics you have on your phone– if you have photoshop, you can size the picture so it will print well by making it small on a 4×6 white background. When you have it printed, just cut the actual picture out.