12x12 stone tiles from home improvement store, add felt to the bottom for inexpensive placemats or hot pads.
How to Make a Mosaic Flower Pot
Mosaic Mandala. This would be a really nice small table top. It needs to be relatively flat to be used. Love the colors and design.
Pick a flower or plant and lay on top of a small piece of clay and use a rolling pin to make an imprint in the clay. let it harden.
DIY - How to Make a Table Topped with Letters