Quoting Chris Adazelbon on Gringat the Repugnant's "Xalos"
Woah. Cool For a little guy. ^_^ . How did you change the sword color?
I used Umbra. Then I used a precision screwdriver to remove the circuit from inside and put the blue one in from Matoro's ice sword (the red bulb is in matoro's sword now, and I plan to use that for a toa of neon sometime). It's fiddly, and you have to make sure you don't lose the little bolts when you're doing it. Shadowgear6335's the first guy to do it, I think.