I am fascinated with lid design--thinking past the usual knob.
This is a medium sized jar with an experimental handle and is just as easy to grasp as a knob, if not more convenient.
In this case, the idea might even be expanded to a lid/scoop design. But in order to do this, the base of the jar would have to be more straight sided to make room for a scoop to work. (Both the top and bottom would have to be designed to work together.)
So other forms should be considered.
A bar works.
Or reverse your thinking and consider a finger hole recessed into a built-up lid with a sealing solid base below the finger-space. I've made these, although I don't have one to photograph at the moment.
Or something that locks down with another element; a working two-part lid design.
Another brain-teaser is figuring out how to make a screw-top lid-- Just a simple, run of the mill, screw-top jar like the ones you have around the house--from the cabinet or refrigerator.
David Hendley (http://www.farmpots.com) wrote a thesis about making a tap and die for these lids. Go to the tab "Writings and Publications" to purchase a copy. He discusses tap and dies and includes pictures of an aluminum tap and die set once produced by Bluebird, but these are not currently available.*
Just thinking about it puts my brain in a twist.
*PS If anyone has a Bluebird tap and die set for sale, please let me know.