Ok I tried to think about it . Could not find a thinking smilie but I found this

. Maybe picture of the different "ears" people have made.
Others that popped in my head. Lights ( for LL), garbage cans, different water areas - fountains, water fountains,pools or hidden mickeys and such. All these are pretty easy to do and
legal.
Of the riskier options, footwear or better, inappropiate footwear/clothing, people behaving badly, unusual people in general, children being messy from ice cream etc.
Interactive photos like getting characters to wave to you, CM's to wave or even back to the "flat" or object that needs to be held by the subject of the picture.
Most of these are "beginner" ideas. Expand, throw it around, add to it and make it better.