you can't beat cib games if you want to display your games.
No matter what you do it isn't as impressive as the complete in box copies. Feeling the original boxes in your hands with cool art work.
Sure you could put some cases around them, if you feel it's good it's great, but in my opinion they are just a bunch of lose gameboy carts not worthy since they are without a box. instead they are inserted inside a fake plastic box wich many collectors use trying to fill the emptiness of the cib feeling.
you could put the cartridges seperately in a box on alphabetical order with some leaflets in between also to prevent from further damaging the boxes. lose gameboy carts are not worthy to display, maybe 10 of your favourite games but if you go for more it will take up allot of space.
Lose carts are not easy to display, you could put some fake boxes around them but to be fair you could do that even without owning them games. Just store them in those regular plastic gameboy clear cases to prevent damage. also takes up allot less space than custom boxes with artwork. If you have original boxes than you can display them nicely. I don't get why people try so hard to display lose gameboy carts. Allot of work for minimal results.