My son wanted a Electric Guitar Birthday Cake for his 10th birthday this year so I set out to accomplish the task. The body of the guitar is all cake while the neck is fondant covered wood for more realism.
In making the brown fondant for the neck I mixed a little brown icing gel in the white MM fondant but didn’t thoroughly mix it. The result was a VERY realistic wood grained neck. Other than the neck, the entire cake is edible. Needless to say both he and his friends, as well as their moms were impressed.
Dude!! That rocks