Stones for painting Marble cubes 18 mm grey-white 6 pcs will give you space to develop your creativity. Get the whole family involved and paint whatever comes to mind. The cubes are smooth and that’s why they’re ideal for painting with markers or paints. They’re used not only as painted stones, but also as decorations for home and garden. Marble cubes are also known as “whiskey stones” or “ice stones” and after thorough cleaning and freezing, they can be used in whiskey and other drinks for keeping them cooler for longer and for eliminating melting of ice cubes.