This was done for an ATC challenge on another site. We were tasked with creating an ATC for Australia Day. According to information from the web, symbols of Australia Day include the flag, the Golden Wattle (National Flower) and the opal (National Gemstone), plus the colors yellow and green. I found images of stamps from Australia to create the background and then imposed the flag in the shape of the country, the flowers, and opals. The lyrics to the National Anthem are in green and yellow.