My Invention Project?!?

In my science class, we are required to make an invention project. I already have an idea, so I don't need any help with that aspect. It is going to be a communication system for non-verbal individuals with poor motor skills. What I mean by poor motor skills is they have a low mental capacity and are unable to learn and use sign language. This particular one is targeted for children aged 9 - 12. I need to take or download pictures for this. It should be of things that the individuals need to say that they want, like a toilet, bathtub, pool, etc. Do you have any ideas on what I should take pictures of for the invention? Please help! Thanks for taking the time to help me!

Tagged as: bathtub, communication system, invention project, science class, Sign Language