I like some of the existing lights so I could really only redesign my favourites:
Flashlight 1: Take a sunwayman m10r/m10a and give it an electronic switch, knurling, a decent pocket clip, more emitter options to choose from at purchase time (warm, neutral, cool), and replace the strobe with either a lower low, or another mode between low and medium
Flashlight 2: Take any form of quark tactical and give it an electronic switch, a 40-60 lumen mode for at least 5 hour runtime on single AA (should be possible if sunwayman can do it), and again: more emitter options to choose from at purchase time. No limited runs!
Flashlight 3: A preon revo SS that starts in medium, and has less finicky mode switching.