The Create Stencil From Display option was first performed on a pattern that had a large area of light colors in the center and was mostly dark in other places.  A colorful picture was then loaded and a Bottom Corner Wedge Diamond Mirror Pattern was rendered.  The Set Mask Background Image option was chosen to set that picture as the Mask Background, making it static in the darker portions of the created Stencil.  Another photo of a Chinese newspaper was loaded and an Oval Funnel was rendered.  Rooms was enabled with the Tunnel variety.