I do not stash, per se. I do have two types of fabric that I collect: Daiwabo Taupes and Liberty Tana Lawn. Even those have quilts that havev either been started or in the planning stages. Everything else was pretty much purchased for a specific WIP.
I would like to have a stash but my tastes change too much. Not to mention the fact that I do not design my own quilts. I tried a couple of times and it is not for me. I like to buy patterns and occassionaly kits. So having a large variety of fabric at my fingertips for midnight inspriation flashes is not something that is a necessity for me.