I made an electric guitar cake covered with fondant (in my photos) I used a real 1/2 sized guitar belonging to the birthday boy but you can get a template from the betty crocker website
http://farm5.static.flickr.com/4015/4362464609_277e24897b_b.jpg
here's what i've found w/ scrummymummy's idea 
http://www.bettycrocker.com/NR/rdonlyres/1D455E95-1689-45D7-BF55-BEE151B79C84/0/GuitarCake.pdf
i did guitar cake also, covered in fondant. used molded chocolates for the neck and headstock. it was fun to make and it was a big hit
I made a electric guitar cake for my neice's wedding groom cake. She took a picture of her fiance's cake and I enlarged it to make the template. I made the neck of the guitar out of rice krispie treats and the rest of the cake cut out of the pan of cake. They loved it!
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