It's taken a few attempts to get it right (hair slightly damp but not too wet, and the right amount of the stuff) but I've really started liking Lush's Goth Juice:
usa.lush.com/cgi-bin/lushdb/02689
It smells great, it's vegan, and it's purple. And "made from the tears of Robert Smith."
usa.lush.com/cgi-bin/lushdb/02689
It smells great, it's vegan, and it's purple. And "made from the tears of Robert Smith."