Create monster hair?
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Any crusting Buttercream should be good. Try Indydebi's :) Good luck!
I've used the Viva crusting buttercream for hair/grass effect with either the grass tip or the jumbo grass tip and that holds up well. I used canned frosting (!) for this monkey hair and it was done the night before the party . It's hard on your wrist - or at least it's hard on mine - this monkey took me a couple of rest stops! Good luck!