My primary obsession is colour, which, along with attention to detail, makes me ideal as Sacristan in my local parish church where, along with other duties, I'm responsible for ensuring the hangings and vicar's vestments are the correct colour for the season/occasion. I also colour co-ordinate my clothes, and have a reputation for having a good eye for colour; I am making an effort not to obsess about wearing colours according to the time of year, but it's not easy.
I also knit trauma teddies and striped jumpers for refugee children, so that's another way I can channel my obsession into something useful, and I do adult colouring. The last two also give me something to do with my hands when I'm watching TV or my husband's talking to me, so I don't fidget.