From the Desktop Background menu you can select one or many wallpapers to display. Selecting a single image will display it permanently; selecting multiple images will begin a slideshow.
To customize these settings, first choose a file location from the Picture Location drop down menu or use the Browse button. As you can see in the image, this folder is called Wallpaper. The displayable content of the folder will appear in the main window, and it is from here that you choose which ones to display. The tick you can see in the top left corner of each image means that it is selected to be displayed. Remove the tick from any image you don’t want to see.
The options at the bottom of the dialog window are similar to those found in Windows XP and Vista. The picture position option decides how the picture is fitted onto the screen. Fill is the full screen option, Fit is a widescreen option, like Letterbox on your TV, Stretch will resize the image to fit the screen, Tile will place the image multiple times over the desktop and Center will place the image in the center of the desktop framed in black.
The Change Picture Every: option is for the slideshow. If you have selected multiple images to be displayed, it automatically enables this. You can select from the drop down menu practically any timescale from ten seconds to one day. The last option is to shuffle, or randomize the images when being displayed.