My friend's Jester turned yellow when it got left in a puddle of energy drink overnight, so I would say that yes, there is a dye out there that will work on them.
i think it would work fine, only i would be scared because you would be soaoking all the shit inside, sure water gets in while skiing but its not always %100 soaked. Ya dig?
I dyed my griffons and it rurned out dope! just get a bucket put boiling water in it and rit dye and it works perfect. leave them in there for a while but check every so often!
I acually just sold them but... a bunch of my friends dyed theres so mabye i could take a pic of theres and post it. But it really does work perfect just make shur the water is boiling hot!!!!!!!!