What could I make out of recycled popcorn metal cans?

depending on the room you have. You could turn them to the side, fasten together and use as storage shelves in the garage for tools, potting soils, seeds etc. Or inside for toys. Just make sure there are no sharp edges, and you can use metal paint to paint them if you want.

https://www.pinterest.com/janetgrahamjohn/popcorn-tins-repurpose-renew-redo-reuse/

The seasonal ones make good containers for seasonal arrangements that could be used from year to year and store in a garbage bag to keep them clean the rest of the year.

Paint them or Paper them and use for storage or Plants

fasten them together. Turn sideways and use as storage. In garage for tools, potting supplies etc. Or inside for shelving or laundry room. Paint them or not. Make sure there are no sharp edges!

Pinterest has lots of fun ideas:

https://www.pinterest.com/mendy_treadaway/repurposed-popcorn-tin/?lp=true

Use them to store emergency supplies in.

It's my pleasure....

More ideas here:

https://intelligentdomestications.com/2016/01/8-clever-ideas-to-upcycle-popcorn-tins.html

Great storage containers or use them to use as gift boxes. Fill one with Christmas cookies and send it to me. Also, teach him how to pop corn from scratch. A lot cheaper and better tasting.

Hi Rita, hope this helps you create

https://www.diyncrafts.com/25538/repurpose/20-crazy-creative-popcorn-tin-repurposing-projects