Something I've been meaning to try for a long time is make my own nut butter. I'd finished a jar of pb yesterday so figured I'd give it a try.
I had a bag of mixed raw walnuts, hazelnuts, cashews and almonds, so I roasted the whole lot then processed it with some sea salt. The result tastes mild and earthy with lovely roasty notes. It's easily as good as any almond butter you'd buy in the shops, and is certainly a fair bit cheaper depending on the brand.
It was so easy that I'll be experimenting with it again for sure!