How to Use a Paintbrush With Gimp. The GNU Image Manipulation Program is a free alternative to pricey image editors. This no-cost, open source software runs on Linux, UNIX, Windows and Mac ...

It's got a hard shell and is shaped like a square, which holds the brush shape no matter how tossed around your bag gets. Now for the exciting part. Morphe's Square Snakeskin Case is only $19.99.