Growing up, we played dominos at my grandparents house. I have a stash of dominos in my craft supplies because you can do lots of things with them like making jewelry or home decor pieces (and they remind me of playing dominos with my grandparents). Dominos can be picked up new or in second hand stores. Here's a fun idea for your new domino stash:
I started by painting the frame in Folk Art blue and red. You could let your children paint it with swirls of color and it would look really fun too!
Glue the dominos down with Mod Podge and let it dry. Once I added the domino rim I noticed it took a super hero, patriotic turn!
Who else to go in the frame but my dog, Captain America himself! Ok, his real name is Rocky (and he is a super hero in his own mind).
You could seal the entire frame with Folk Art varnish in satin or gloss or leave it alone for a matte finish. (Insert firework sounds)