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.
One of the keys to success is passion. If you care about something or want it naturally you won't need to force yourself to work on it. The passion will be your fuel. Only work on things you are passionate about.