I wanted to be able to organize my paints better when not in use, so I found this model: 

https://www.printables.com/model/424043-gridfinity-army-painter-speedpaint-holder/comments

I don't have drawers and rather limited desk space, so I wanted to convert these into something stackable. This could probably be improved, but it works for my purpose. 

I printed this with tree supports on a P1P and they were very easy to remove with some flush cutters or pliers.