You can do a kind of sgraffito with felt. Really, you are making layers of color, then instead of scratching, you are using a scissors to cut down to a different color/layer (see the silhouette on the right). In this case, I used a sewing machine to outline where I had cut. This is one of my first felted books, probably from somewhere around 2005-06. It has lots of unintentional holes in it, too.
And you can do sgraffito with ceramics. Here is the Sheep Shuffle birthday bowl I mentioned before. I also wrote a story about my experience with the kids in the studio here. I painted three coats of black (Black Lab), then three coats of light tan (Golden Retriever), and carved into it with a needle tool, blowing away and brushing away the crumbs.
In a post at the end of September: the process in glaze, step-by-step. Stay tuned.