I recently learned a unique way to use the projector, which is the most interesting new gameplay after taking pictures with the projector!
Just to find some beautiful photos with windows, especially the windows are very realistic. It can be fake and real when you project them on the wall. There are also some super beautiful night scene photos. I found some photos of my own bedroom and tried them. It feels pretty good.
How to project by the phone:
Use your iPhone, open the photo, click on the lower left corner and select air play.
Projector model: BenQ GV1
Jason 
James Chow 
Skanda