This is part of a project I am working on around rentable shopping carts. This model serves as the RFID tag you would be issued as part of a service. I don't know what else you could do with it. Stash your stashables I guess. It was a quick and dirty model.
I printed it, gave it some clean up with sand paper then painted it flat black. I made a couple of labels that detail things like the chip inside and the serial number of the tag.