The name, "HomerOSX" refers to the new desktop environment that was released earlier this year. Although it's not an official operating system, it's easy to say that it's similar in a lot of ways. Whether or not you want to install it or not, you should download a wallpaper that will match the operating system. Even if you don't use the desktop, you may still want to have a nice looking background that's free of charge.
As stated earlier, downloading wallpaper from free websites is often free. However, this does not mean that you can expect an application to come with a free download. There is a very good chance that you will be required to pay a small fee to get a license to download the application. Since most people do not have the time or the inclination to download large applications from several different sites, it's best to keep in mind the fact that this desktop environment was available for free and that there are no better options.
One of the greatest advantages of getting an application that's free to download is that it can be used as many times as you like. You don't have to worry about re-installing it every few weeks because the download only lasts for a short while. Most people prefer to save their hard drive space so that they can make room for other files so there are many other uses for the free desktop wallpaper.