52 Week Capture Challenge - Come join us! This can be made suitable for children getting them involved in seeing the world around them in a different light. Give them a photo album and print the photos for the child to arrange.
30 day gratitude photo challenge: Gratitude Positively Present is an AWESOME site if you're not familiar with it yet. But I sometimes feel like photo challenges can cause us to get too become too perfectionistic, which makes gratitude super hard!