[see dove bowl in blue] Porcelain bowls designed by Geraldine de Beco for Bernardaud in France. When the bowls are filled with a liquid, the image of an animal is formed (cat, dove, wolf). These are bowls, but I would love a mug like this!
A combo cup and saucer (called a Hotcup) design by artist Jorine Oosterhoff. The air between the cup and the saucer functions as isolation. The saucer functions as a warm blanket wrapped around the cup.