I converted a Celestia toy into a still-life study object. I achieved this by pulling/carving off her mane and tail... filled in the holes/scuffs with wood caulk. Sealed with acrylic gesso. Primed. Then spray-painted white. Plenty of sanding in-between as well (to keep the surface as smooth as possible).
Then I set her against a black background, with one light source coming from above her.
Great exercise (and more interesting than a plain old sphere).
Crappy photo again. Can't find my camera charger....
9" x 12" Oil on canvas board. Paint: mars black, titanium white, naples yellow, ultramarine blue.