Maybe glue on a window or glass. Watercolor mosaic - really like this idea art journal. Paste paper works too. Great project for a class project, upper or lower grades. Mounting the work on canvas adds a very professional look to the completed collage.
Pinner said, "I adore painting on book pages and especially love the transparency of water colour and the manner in which the letters peek through the picture. I often paint on book pages and then glue them onto my sketch book." This is a good idea.