The world's best violins come with strings made from catgut—which isn't typically from cats, but does definitely come from the inside of an animal. If you want a more vegetarian alternative, though, how about a set made from spider silk?
Those of you with arachnophobia may want to turn away from your monitors. This enormous inflatable spider puppet was built by UK artist Tim Davies for street and carnival performances. Details are still scarce on its inner workings or controls but Davies mentions that the legs are "air-powered." [TD Artwork via Technabob]