I saw this and had to comment.
I have a friend who made a kolsch and put 5 lbs of roasted beets (chopped up) in the secondary. It blew the lid off!
That stuff was mutant-radiation magenta with a pink head and tasted like earthy beets in kolsch form. Great if you like beets. Otherwise, not so great.
But yeah, great for color - and flavor if you like it. I'll try and find a pic.