I’ve never wondered how Darth Vader bathes; I would assume it would be in a dark room with dark towels since he was on the Dark Side of the Force.
With this Light Side/Dark Side towel, you can decide each morning which side you will butter your toast on. You can dry your face with the Light Side and your bum with the dark side, or vice versa.
It’s a 59″ x 31-1/2″ bath-size towel, made from 100% cotton. You can get yours at ThinkGeek for $29.99(USD). That seems like a lot of money, but I’d wager Star Wars fanatics would buy one, then hang it on the towel rack never to be used like Mom did with her “good” towels back in the day.