Pet Guinea Pigs Wallpaper Theme. Guinea pigs can be lovely pets to keep because they are friendly, easy-to-handle and possess an attractively calm demeanor. The fact that they are little rodents further makes them easier to care for and convenient to walk around with. Now, if you love guinea pigs or would want to get one in future as a pet, dressing your desktop with pet guinea pigs theme can be a brilliant idea. The Windows theme comes with 14 HD wallpapers featuring images of different breeds of guinea pigs that are just as stunning as they are elegant.