Allow your mini Matisse to turn your windows, mirrors and glass surfaces works of art. Rainy Dayz Gel Crayons draw brilliant vivid colours on glass surfaces and paper too. With the addition of a wet paintbrush, they can add amazing watercolour effects. Once you (or they) have got bored of their latest masterpiece, the 12 bright colours wash off easily - so they can start all over again! Colour: Multicolour.