Here's one of my favorite ones. I limited myself to three layers of Gelli printing and just five colors of paint.
And while I was doing it I stumbled upon a fun result. Unexpected by me, but surely others have figured this out.
And a rubbing appeared. I loved the look of this, so I kept the stencil there and continued to clean my brayer on the paper, leaving the stencil in place. I had a few papers going -- so that I kept paint in the same color family together (reds and oranges on one sheet; blues and purples on a second sheet) and produced even more mono prints... loved it!
Here are two of the stencil behind-the-paper pieces. You can see the different brayer strokes in the different colors with the hidden stencils.