KasperHviid: Not sure if this is the image you go for, but here's another option:
https://www.amazon.com/BigMouth-Inc-Busters-Spare-Hiding/dp/B00L2DKS7E

KasperHviid: You could also use a compact cassette case with a styrofoam inlay.

nightcraw1er.488: If your not bothered about space or portability, why not make a cardboard box. Would cost far less, and be simpler than plastic.

Maighstir: I had the idea recently to combine two ways of making my GOG shelf physical. One would be nice cases with awesome printed covers for burned DVD's, and the other would be USB sticks, on which the installer could easily be updated rather than having to use a new disc (and many computers today -particularly laptops- don't come with an optical drive).

I did look around a bit and found a few options:
* this Blu-Ray case like thing which replaces the disc holder with a holder for a USB stick
* this similar one with half the height from the same US company. Both this and the previous are sold in packs of 50, making 40-50 $US a pack, which I think is a bit much to try out.
* This probably-also-half-height one sold from a Swedish store, but only in packs of 100 (slightly cheaper per case though, at about $US 60 a pack).
* And this one that comes with an 8GB USB stick but looks to be the same as the previous one and costs about $US 10 each. Also from a Swedish store. Curiously, it's a geneaology bookstore.

Now, I would like to as whether any of you have found something similar in smaller pack sizes? Of course the covers would most likely be different sizes from the DVD cases our community have already created, but it could be an interesting take on the physical media.