Traditionally, a guitar is defined as an instrument that has a long, fretted neck, flat wooden soundboard, ribs, and a flat back. That renders this collection of awesome axes undefined.
The completely custom made guitars shown in this gallery go from finely carved craftsmanship to downright funky. My personal favorite is the slick Steampunk V2 model. Just the look of it makes me want to slam out some heavy metal Iron Man riffs.
More unique and cool custom guitars can be viewed in the related trends below.