First of all, remove any grease marks by washing the glass in warm soapy water and then dry thoroughly. Our glass is 7cm high x 7cm diameter. Almost any glass is suitable but for the best effect, we suggest using a coloured or frosted glass. Draw a simple design on paper. We’ve chosen butterflies but a leaf or flower design would work just as well. Place the design inside the glass and hold in place with some black felt. You should be able to see the design clearly through the glass.