not sure what color is your favorite?
buy them all
There's a big building called Shibuya 109 near Shibuya crossing, which you should definitely avoid if you don't like crowds, and I recommend popping in to every girl (there is a separate location for guys nearby) coming to Tokyo. The best thing about this huge shopping center is its variety. Seriously there's something for the rock chick like me, glam ladies or even hip hop style lovers. Also you are likely to appreciate the very low prices on most of the goods since practically half of the store is constantly on sale.
I wouldn't dare to wear this thing on my head
skulls are really big here
even my camera got dizzy from this explosion of colors