These cans are so great for creating an assemblage. They make fabulous people. You can attach the arms and legs from the inside and then snap the top back on so that all of the "hardware" and "connections" are in the inside. Embellish/collage the lid of the can which is the front of the person. Many people will put a jump ring on the outside and attach some beads for arms. Then stack some washers or bolts for the legs/feet and the creature stands up!
The Star Wars Lunch box would be a great toy for a child who loves the series. It is 6" square and the other two cans are 3".
Of course, if you want them for safety pins and small buttons, that's okay too.