I searched some easy ideas below. I may make one of them this year : )
Below are all easy-to-make cake tops (with recipes for making cupcakes), hope that can be useful to you too!
Merry Christmas!!!
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1. Santa Claus Hat
http://community.qvc.com/t5/Blogs/Santa-Hat-Brownies-Plus-Learn-How-to-Carve-amp-Turkey-amp-How-to/ba-p/1853855