Before I sat down to figure out concrete-esque rules for my book's power system, I re-listened to Sanderson's First and Second Laws, and I think I did a decent job (still editing for cliches) - but as with any post here, please be critical!
The source for my system amounts to something along the lines of semi-conscious particles that sit between matter and energy, hiding in the background of other cosmic noise, called the Flow. By manipulating this force (either by channeling it directly, or using it to manipulate other things), one could produce any number of other effects if one was born lucky enough to have influence over the flow - known as Vessels.
To use it, one required focus, and using it required relative amounts of energy - with a small side effect: relative to the power of the use and the time holding it, the force would slowly damage the Vessel's body, first uncovering recently healed wounds, and moving back in time, both opening and expanding old ones.
Small expenditures (if one could, moving a marble an inch instantaneously) would result in soreness, and a bit of an ache; while Larger ones (i.e. funneling the energy from a forest fire into a lake) would begin opening scratches and unmending fractures, and leave the user exhausted on the edge of passing out.
I can post up specific powers and their explanations if this doesn't prove absurd as all hell.
