RE: Color tweaking functions

Tab:
> I'm not sure of exactly what form they'll take, but I plan to work on
> Colors 4 at some point in the near future and will devote some thought
> to it.

Please keep currentColor on your mental radar when exploring this.

* {
	color: blue;
}
div {
	text-shadow: 1px 1px somewhat-lighter(currentColor);
	box-shadow: 3px 3px much-darker(currentColor);
}