I was fooling around with this idea a long time ago for an RPG char. If we are considering all of SW canon, here's what I came up with (for a Jedi, albeit one perhaps more gray than most.) It would be for practitioner of Form V, practiced in both shien and djem so:
The crystal would be a Krayt dragon pearl, giving the blade a pearlescent color, with a lens of stygium crystal adding a pale violet tint. The emitter would be flush-mounted with a double blade shroud. A back-up power cell would be included in the pommel, and it would use a bifurcating whatever-the-hell which is the circuitry to allow the blade to be ignited underwater (you never know.) I had thought of the idea of a dual-phase lightsaber, but even ones that aren't dual-phase still have a blade length adjustment.
"You fought with Captain Reynolds in the war?"
"I fought with a lot of people in the war."
"And your husband?"
"I fight with him sometimes, too."