I've been trying to figure out a good way to organize my airbrush paints. Right now I have them sitting in a cabinet on a couple of shelves. Does anyone has a special way of storing them, such as a rack or stand you've made?

nope, i just have mine all piled in a cardboard box

Just sorted by color on a shelf.

I cut out 2 19" discs from plywood.  Drilled bottle sized holes in one of the discs.  Placed spacers between the 2 discs and screwed them together; then mounted 4 old casters to another piece of plywood-roughly equidistant from the center.  Ran a short piece of threaded rod up through the center of all plywood to keep things aligned and now have a great rotating bottle holder for about 30 bottles(est).  All components were made from scrap material so cost was $0.00

An old spice rack.