Ball chain (or chain ball) is a great mosaic material. When grouted the line of balls protrudes through the grout. It can be used in all kinds of mosaic projects, for outlining shapes, defining segments, creating lines or just adding another element of interest.
If you are using thinner ball chain you can create height by laying a row, allowing it to dry and then glue another row on top. The thinner ball chain is also great to use in making mosaic jewellery.