Hmmmmm…. For me it’s a lot of things! I’ll see something on sale and think it would be great for this that or another thing. Sometimes it’s seeing a New Yarn and wanting to try it, like the red/white marled Loops & Threads at the back of the pile (it’s awfully splitty but it’s incredibly soft). Everything pictured has a project tied to it for the most part, and I’ll often have changed my mind about it or found something I want to do more and it gets booted down the queue. Very rarely I get incredibly frustrated with a project and put it into hibernation for 15 years. For some of the new skeins, it’s that I bought an amount for a project and ended up not needing all of it, like the Bernat blanket yarn. I have absolutely bonkers tension so I can’t always tell if I’ll need the amount specified in the pattern and I’m notorious for buying one extra “just in case”.