Group Effort Collage in Photoshop

Our task today was to choose a high def image 1920 x 1080 RGB 72dpi as a background.  We could choose any theme we liked.  We then had 20 mins per picture to pass along and whatever background you were given you had to then add your new image vector mask to the new background.  The whole class added one image to everyone elses background until our original background came back with the whole collaboration of the class.