How about creating a special section in the cash shop where certain cosmetic items could only be purchased with tokens? Then tokens wouldn't be general store credit and it would be a nice sink for them.
I've already said this before but Jorb, if you feel lazy and don't want to make new hats for stuff like this, just recolor old stuff or even existing hats (I'm sure people would kill for a golden recolor of the sprucecap with the sparkle effect used on the skull cap). That shouldn't take long right?