I recently got into the hobby & bought 5 individual basic lockpicks & four tension wrenches & needed a simple case for them. Something that I could easily carry in a pocket.

Took an old sharpie "professional" marker I had laying around, cut off the felt tip part, pulled out the ink-fibrous stuff inside the main body ....and bam! Simple little portable case for my lockpicks (5) & a couple of tension wrenches (4).
Note: the marker was clean inside. It had a plastic liner that held the ink-soaked fibrous stuff that could be pulled out with needlenose pliers.
Eventually I wanna get something like this...

...so I can squeeze my snapgun in there after slight modification of the pockets.
Sorry for the long post.
anyway... I want to see what kinds of cases you guys use. Either storebought or homemade. I am thinking about making a tool roll/wrap case also.