Here is a nice theme for your Windows 7 computer that you will definitely want to download. This theme released by Microsoft contains 10 beautiful images of waterfalls.
Gurgling canyon creeks, rushing mountain streams, and cascading, terraced rivers: Waterfalls in all their glorious diversity are featured in this free theme for Windows 7.
You can download the 10.8MB theme pack from here.
If you wish to simply use the wallpapers, after you have applied the theme you will find them in this folder:
Like all theme packs, these too can be used only on Windows 7 Ultimate, Home Premium, Professional, Enterprise editions, but you could extract the wallpapers if you like them and use them on your desktop. Incidentally, this theme can be used on Windows 8 too. Go here if you want to learn how to make a Windows 7 themepack.
If you’d like to see your art on such themes, you can submit your art, photographs and creations to Windows Personalization Gallery.