Glenna shared an intriguing post today called Postcards from the Stash on her blog Knitting to stay Sane (if you haven't read it yet, pop on over there and take your time. But don't forget to come back).
Her post got me thinking. A LOT. About my own stash. And it occured to me that these were important thoughts that might be worth sharing. (Thanks Glenna).
When I first started knitting I swore I'd never have a stash. My BKF recalls the conversation clearly and her barely disguised chuckling throughout. I was only ever going to work on one project at a time. When I was finished (or almost finished) a project I'd choose the next pattern and buy the yarn to knit it.
"What about left-overs," she asked? Well, I was only going to buy the exact amount of yarn specified and any remaining balls/skeins would be returned to the store (it honestly never occurred to me at that time that a yarn store could actually go out of business in the time it took me to actually finish up a project).
What about small bits of left over yarn? Oh, I'd just toss those. What could you do with a wee bit of yarn.
You can see how naive I was. It really is laughable and it's a credit to my BKF that she didn't roll on the floor howling.
So the first lesson I learned as a new knitter is that "Stash Happens."

These are my two baskets of leftovers (one for worsted and bulky yarns, one for Dk and finer). I have one more sweater bag full of single balls of leftover yarn which I couldn't or wouldn't return.
I blame the size of this portion of my stash on Afghan knitting. It is impossible to knit multi-colored afghans and not have lots of left-overs. This portion would be larger but I periodically bag up some of this yarn and gift it to my mother for her charity hat knitting.
My husband says it's just like the feeding of the 5,000 -- no matter how much is knit there's always a dozen baskets of left overs!
Normally I'd also include gift yarns in the Stash Happens category (I can't be responsible if people just give me yarn, now can I? ) But much to my amazement it looks like I've knit up all my gift yarn so I'm looking forward to replenishing that section of my stash in December/January. Oh yes, Santa, yarn is on my list!
Next up is the Intentional Stash. These are yarns I specifically purchased for myself and have set aside for future projects.
My favorite category for this list is souvenir yarns. Despite all my travels, this is a smallish group as well because I generally don't pick up more than a skein or two of something new and I'm often excited enough about it to cast on immediately.

souvenir yarns
Then there's the yarn with interesting textures. I suppose you could call this novelty yarn, but for me it's just on the edge. It's yarn that knits like normal yarn but produces an interesting texture -- like Berroco suede or plush or Polarknit yarn. I usually buy this stuff when I see it on sale for a great price and it speaks to me. But it's "just for fun" and very inexpensive so if I don't find a use for it in a reasonable amount of time, I pass it on.

fun yarns with interesting textures
Sock yarn-- I have acquired sock yarn for 2 projects. Just in case I get the sudden urge to make socks one day. You never know.

wool-free sock yarn
And the two newest categories to my stash are:
My hand-dyed yarn. At the moment, I've just been playing around with worsted weight silk but I have plans to try other yarns and other dying methods so I have a feeling that this will be my fastest growing area of stash (I can definitely dye faster than I can knit).

worsted-weight silk hand-dyed by me
Cone yarn (which might be included in any one of the categories above but I keep the cones separate). Cone stash is very deceptive. It may not look like much, but there are thousands of yards of yarn on those little soldiers!

silks and stainless steel deceptively hidden on cardboard cones.
If you looked very closely at my yarn, you'll see there's not a single strand of wool to be found anywhere. Mine is a "wool free" stash of silks, linens, cottons, hemp, bamboo, stainless steel and acrylic blends.
So that's my stash today, but Glenna got me thinking about my future stash. What yarns would I like to have on hand....hmm, that's going to take a little more time to ponder. I'll have to get back to you.
In the meantime, let's keep Glenna's question going. "What yarns are you stashing?"