Mine was map of middle earth I am a big fan of canvas print and often buy new ones for my collection. The truth is photos can be printed onto almost any material; the key is finding the material that does the photo the most justice. For many years that option has been photo paper and later glossy white paper.
One is that the practice of creating is inherently without boundaries or parameters. It forces you to use your imagination, to think through how you are going to convey your image or message through art.