Trace the shadow of your sculpture - foil figure or another object with a clearly identifiable shape. Ask, "If I hold the light here, will the shadow move?" Explore how the shadow elongates and shortens as the light is moved.
Watercolor on book pages -- I really like the idea of doing this. Would be really easy to find a random book at Goodwill on the cheap and use it like a "practice" art journal. Frame for holidays or art!