I picked these up at Michael's. If you use the 2 ounce craft paint bottles like I do, then this is a great idea. Just figured I would share it.
This is made by CraftSmart, for those of you that don't have a Michael's nearby. Perhaps you can order direct.



Here's a shot of he over the door paint rack. This is two of them, side by side. I tried to include the hooks in the picture, so you can see how it attaches. As I go through the bottles, I am shaking them up and turning them upside down, so that I can readily see the colors.

With the 50% off coupon, it cost me twenty bucks to store over 100 bottles of paint, in a dead space area.
An excellent idea!