Have you ever taken pictures of your knitting, only to realize that you seem to be going through some kind of phase? Maybe it's all red. Or every piece you've worked on in the past month has moss stitch in it. Or you've only been knitting socks. And the phase wasn't really a conscious choice.
I'm currently obsessed with cables. Everything I'm knitting, from socks to hats to sweaters, has cables in it. It wasn't until I wanted to take pictures of my WIPs that I noticed. Cables don't photograph well with flash -- or if they do, I haven't figured out how, and... it's all cables.
What knitting-related thing have you obsessed over in the past -- or are currently obsessing over? Now that I've noticed it in myself, I wonder what others have found irresistible.