Ryan chose to draw from scratch and from memory Mace Windoo's purple lightsaber. He designed and drew it 100% all by himself. Including the red button, and the yellow light (which, he says, if on, signifies how much damage the lightsaber can do).
Note the two colors of the actual lightsaber; the outer/lighter color being the "glow" of the inner/actual lightsaber itself. Ryan's idea, design, and accomplishment.
Ryan further informs me that the tan color is part of Luke's Obi-Wan's cloak/robe on the Jedi's arm.