The attached photo is from an idea that I got from Minnflyer. You take a 2x4 and drill 1/2" holes in it equally spaced down the middle of the board at an angle (15 degrees). Then when you mount it to the wall (I used concrete fasteners), you just plug 1/2" dowels into the board as you go and hang the tails from it. I think I can hang 6 on one 8' 2x4. It cost all of maybe $4 to build one rack and it is strudy. The angle keeps the dowel from bending and sliding out.

Regards,
Curtis