For some time now, I have wanted a miniature version of the mechanical paint can shakers you find at hardware stores. Not for paint, mind you, but for natural peanut and nut butters. I get kinda annoyed having to stir the oil back in all the time. And if you're not good at it, the early servings from the jar are all oily and runny, while the last of them are hard as a rock.
Peanut butter after 5 minutes of tumbling.
Hazelnut butter after 10 minutes of tumbling.