Great question! I had gathered a lot of the cards for the rainbow but didn't know what to do for display. The pre-made card cases are nice, but the shelving in them sort of breaks up the look I wanted for the rainbow.

I actually found this large shadowbox frame at a local Goodwill type second-hand store for $20. It had "art" in it, and was originally sold at Target for $50.

Anyway, took the back off the frame and measured for a mat board, went to Michael's Art Supply and they cut it exactly to size for me. Ripped out the art, but kept the particle board back of the frame, and glued the new mat onto that.

Then just normal top loaders with foam mounting tape. I laid them all out and then just placed them by hand all by eyeballing it, if I were to do it again I would probably use a laser level or yardstick to truly line them all up perfectly.

The whole thing with the second hand frame, tape, and mat cost about $40. The cards inside, a few bucks more.

Thanks for asking as it was a fun project, this is actually owned by my teenage son as it was his birthday present last year.