Oh yes, I finally figured out which lightsaber colour’s my least favourite: purple-white with shimmering rainbow colours ala Gantoris’ lightsaber from the Jedi Academy Trilogy. That thing’s too outrageous even for me.
Wait, what? There’s actually a rainbow lightsaber in Legends?
(EDIT: I googled it, but all I can find are pictures of a guy with a regular-looking purple lightsaber. I guess even the illustrators thought it was too crazy.)
There is no picture of it. To the best of my googling, it was only ever described like that in Dark Apprentice. Every other mention of it dropped the rainbow.