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I found these cute monster cupcakes on CakeCentral. They are made by Jennifer and she told me that she have used buttercream icing and Wilton tip #233 (grass/fur) to make the little furry cupcake monsters. The eyes is also buttercream icing and are made by using Wilton tip #12 (round) and the pupils with Wilton tip #2 (round).
I think they would be perfect for a space themed birthday party, or maybe just for fun?