This Kaleider Masking example combines two images rendered with two different effects applied to two different source images.  First, a photo of a mural with a large face was simply reflected horizontally by a Split Rectangle Kaleidoscope.  That image was both set as the Mask Background Image and also used as the basis to create a Mask Stencil.  The result was that the darker portions of the image became the Mask Background, while the lighter areas were 'transparent' and changeable.  Then another image was loaded and a Split Triangle Funnel was rendered, shifted and scaled until an interesting pattern fit nicely within the Mask Background.