Gee... I sure hope you were looking for desktop wallpaper, and not actual...you know- paper for the walls wallpaper... =P
You can check out these different dolphin wallpapers Neve:
Depending on where you live some stores like lowes and home depot have this kind of wall paper. They even have samples out that you can see before you buy it. If your refering to computer wall paper go to www.google.com or www.yahoo.images.com they have lots of great pictures and computer wallpaper!