Okay, oddly enough, while the rest of my house might be in layers of chaos, my stash is pretty well organised. I keep track of most (90%) of it on Ravelry, in my stash pages, with individual listings and photographs. And the main storing of it is here:
It was only a couple of weekends ago that I went through all of this above, as I was already taking inventory of Gaia’s Colours’ supply of undyed yarn & fibre. These bins contain my personal stash, mostly hand-dyed (big surprise), and are now all properly labelled and organised. I do need to sync it with my Ravelry stash pages though, as I’m a bit behind in some of the older yarns that I bought as a newer knitter.
Overall, I’m happy with how it’s all organised, and I do try to go through it every few months to review what to use, what to keep, what to sell or give away, etc.