Thats a cool one. An app to customise colour and sound? Nice.
There are actually quite a few lightsaber companies I discovered and did a read up about a couple of years ago. Everything from 'flow' lightsabers - for doing flashy spin moves with - to full on contact duelling versions people use in contests. Check out saberforge, ultrasabers, flowsaber too.
Pretty cool stuff .. don't forget your lightsaber safety 101 first though!