Look at the work of Andy Goldsworthy - he is a wonderful artist.
Art can be created using nearly any medium; artists use paint, clay, charcoal, and ink to create their works. Artists like Andy Goldsworthy, though, use materials that are a little more unexpected. Andy Goldsworthy is a renowned British artist who works with found natural elements, and his work has been inspiring children and adults alike all around the world!
Just have fun and remember...
You're an artist too!