Okay, I thought I'd throw out my ideas here too.
Was thinking of doing the earth elements--air, water, wind, fire. Thinking of doing them as humans, portrait-style. Skek also suggested having Fire at the grill, Air flying a kite, Water at the swimming pool, Earth possibly gardening.
What do you guys think? Would the elements by themselves be on theme, or should I have them doing family-oriented tasks in order to stay within the rules?