Link is on the wall in this desktop wallpaper from the Legend of Zelda: A Link Between Worlds game. You can find more wallpapers here.
Once you download the file, unzip it and then:
1. Pick the size you like.
2. Position your mouse cursor over the image.
3. Press the right mouse button.
4. Select "Set as Background" from the menu.
1. Pick the size you like.
2. Drag the image to your desktop.
3. Go to System Preferences and open the Desktop icon.
4. Drag the image into the well.
ESRB Rating: Everyone with Fantasy Violence