A practice room at our school is getting remodeled (or something?) and a closet clean-out unearthed these cool cardboard guitars. The Curse of the Art Teacher obliged me to take them and squirrel them away for a future project.
On an Instagram friend's suggestion, we looked at loads of Picasso's guitar themed work - steel sculpture, representational and abstract paintings and (!!!) a cardboard guitar:
"Still Life with Guitar" Pablo Picasso, 1913
Students used paint and collage to personalize their axes, and they turned out awesome.