I have come to the conclusion that if yarn has rainbow colors I find it irresistible. My current purse knitting has been another gentleman’s plain winter sock from Vintage socks in trekking. The rainbow colors make it quite interesting, and this helps plain knitting just fly!
I’ve got one sock done, but I haven’t cast on for the other yet. I really do only knit this kind of sock when I need something truly mindless, so it goes a bit slow.