I've been wanting to do something like this for a while, and this week I finally got the opportunity.
Vanilla cake with chocolate buttercream were sculpted to create this replica Gibson Casino guitar. The body was covered in yellow fondant and a wood grain was painted on. Black petal dust was then applied along the edges in a gradient.
The neck and head were sculpted from the same cake and decorate with fondant and silver gumpaste details (and some bits of dried pasta). The strings were actually pulled taught and threaded like real strings through the body and through machine heads at the top. I haven't tried, but I don't think you could actually play it.
The birthday boy is a musician and as an added personal touch, a Billboard Top 10 chart was printed on rice paper and placed on the cake board. All the songs are his. And boy do they seem popular.
Happy birthday, and rock on.
-Danielle