I have a shelf on the wall and bought some spice rack shelves. They are 3-tier and expand to 15" wide. They are perfect for Tamiya and Testors paints. You can read all the labels/numbers easily and they have enough depth for two jars of the same color on each tier. Easy to find the color you want. I have the Tamiya paints in number order. One rack holds all the XF colors and half of the other holds the X colors. The other 1.5 racks hold my various Testors bottles and the top shelf holds thinners, cleaners, and glues.
You can find them at most stores like Target, Walmart, Amazon, etc..
Here is a link to the ones I bought:
http://www.copco.com/store/site/product.cfm/id/E61ECCCD-475A-BAC0-5E189E961CC00E54/fid/52916CAC-475A-BAC0-502C53690EA6D270.cfm
You can see them in this picture:
https://www.facebook.com/photo.php?fbid=10203842857139320&l=8dac314afb
In the picture I have it just for the XF colors. I bought a wider shelf and more spice shelves since this picture was taken.