Sutton Slice is a polymer clay technique developed by Lisa Pavelka. This technique is named after her friend, who gave her the inspiration for it.
This is how it works: little pieces of raw polymer clay are pushed into the recesses of a rubber stamp, until all the recessed areas are filled to the rim with clay. A sheet of clay in contrasting color is pressed onto the stamp to adhere to the clay pressed into the stamp recesses, and then the stamp is gently peeled away from the clay sheet.
Result: a design with colored elements raised above the surface of a sheet of clay.
Note: On my previous version of this page, I mistakenly attributed the Sutton Slice technique to Pete Sutton. My apologies to Lisa Pavelka, the actual developer of this technique.