Most of my decks have a self-made bag, some sewn, but most are crocheted all from the same simple pattern, the difference is in the different colour patterns suitable for the deck.
When I get a Marseilles deck someday it will get an embroidered bag
I am now knitting sweaters I started years ago and am now finishing. I found the knitting movement soothing but I lacked the energy to finish them, with correcting little errors to make it fit and have a presentable neckline or collar or whatever. It can take me a long time to finish something, but I usually do get the job done. Making tarot bags is a nice diversion: you don't have to think so much about making it fit (decks have different sizes, but not many models
) and it is not such a big project, so you can finish it more quickly.