Any message from most of the family to one of its members would probably work well for this.
30 Fun & Creative Save the Date Photo Ideas - IdeaStand
This is would be so cute as a canvas poster or even a card!
10 awww-some ideas for multi-generational family photos
I always wanted to do this with my boyfriend! This is soo cute! Boyfriend and Girlfriend heart pictures!
Re-pieced Picket Fence Frames