I Am Searching For Downloadable Pictures Of Children With Cancer For A School Project?

I am doing a class project where we have to produce 4 billboards advertising a non-profit organization. I choose children with cancer, and know I need pictures of kids in order to complete the project. The project theme is Help give children back their dreams. I want to show differant kids with cancer dreaming about differant fantasy things such as romance, adventure, magic, fantasy, things of that nature. So far though I am not having any luck finding pictures so if any one could help I’d appreciate it