I love this idea. Start a savings shadow box with a picture of what they're saving for. This would also be cool for the kids, to teach them to save for something. I think I will frame a picture of my sofa I want to save for. Good idea not just for kids.
20 Shadow Box Ideas, Cute and Creative Displaying meaningful memories
From souvenirs to show tickets to one-of-a-kind mementos, there are a lot of treasures to save from a trip to Walt Disney World Resort! Commemorate your vacation with a shadow box of Disney memories!(Camping Hacks With Baby)
Don't leave the beach on your next vacation without some sand and seashells. You can now display all your family memories in this beautiful shadow box year round. Get tips and pointers to make it easier from thesoutherncoutur.