The top three pieces are decorated using colored slip (liquid clay). The slip is painted on to a slab of wet clay. A stencil was used for the first two platters above. A reverse stencil (leaves were cut out and applied to the slab) was used for the third plate. 

The bottom two pieces use a technique called sgraffito. Colored slip or a pigmented underglaze is applied to the piece while the clay is still somewhat soft. I then use a sharp tool and incise the clay removing some of the colored clay and leaving the etched design.