This is an incredibly sweet idea. "Open when you need to know how much I love you; open when you don't feel beautiful; open when you need a laugh; open when you miss me; open when you're mad at me; open when you need a date night, etc.
Great idea as the kids wait for their turn to open their gift! - "Color Me" Interactive Gift Wrap for Kids - wrap a gift with plain white paper, and attach crayons instead of a bow. Stamp the words color me, and let your kid decorate their own gift.