If you're here, I assume that you can't quite figure out how to make these pictures your wallpaper. That's okay, sometimes it can be tricky. I will try to break it down for ya. If you still can't get it, leave a message on the board and I will help ya out.
1. Choose the picture that you want
2. Click on it to get the enlarged version of the picture.
3. Right click on the picture
4a. Select "Set as wallpaper" from the menu that pops up
4b. Select "Save picture as" -> do this if you are saving the pictures to a folder for later use. After doing this just select where you want to save it.
5. If the picture doesn't look the way you want it on your screen: a: click on "My Computer"
b: click on "Control Panel"
c: click on "Display"
d: click on the "Background tab"
e: The picture that you set as the wallpaper should be in a little screen up top, to your right there is a little pull down menu, from there select "Stretch"
f: Now hit "Apply" and then "OK"
Now you should have that wallpaper just the way you want it :)