In this tutorial I'll show you how to make a Mad Hatter's Hat Cake Topper. It can be used as a decoration or a top tier. If you want the hat to have cake inside, simply substitute the polystyrene with cake.
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Dust the hat with dark green dust (green + blue + brown + black). Dust with the flat side of the brush to bring out the texture. Try not to go over the yellowish areas.