I made this Hannah Montana Guitar cake for my 4 year old daughter’s Hannah Montana birthday party. For the main part of the guitar, I just made 2 rectangular cakes (it was double layers high) and stacked them with frosting between.
For that filling frosting, I combined store-bought frosting, whipped cream, and some raspberry jam, for a lighter flavor. It made the cake! I then hand-carved the shape of the guitar with a knife.
For the neck of the guitar, I used one rectangular cake, cut lengthwise, and also stacked. I hand-carved that shape too. I stuck the two pieces together on the board, frosted and decorated!
Related cakes:
Cool Homemade Hannah Montana Guitar Cake and Cupcakes 
Surprise 21st Birthday Guitar Cake 
Awesome Gibson Electric Guitar Cake 
Fun Homemade Hannah Montana Guitar Cake 
Coolest You Rock Guitar Cake for a 6-Year-Old 
Coolest Life-Size Bass Guitar Cake 
Awesome Homemade Hannah Montana Guitar Cake 
Coolest Homemade Pink and Purple Hannah Montana Guitar Cake
Good job on the Hannah Montana guitar cake! It beats buying a cake pan that she will probably not want again for a long time! Creativity score is five out of five!