This lab requires you to place an image on the server. You can use a photo you took yourself, or something your drew with notepad, or some more sophisticated program. If you want to find an on-line image which you may use as you like, ImageAfter is an excellent source. The National Park Service has some good ones, as does Wikipedia, but you need to check the specific one you're interested in.

From Fluency, 1st ed. supplement, with local modifications.