When using an Apple desktop or laptop that is running the Mac OS X operating system, you navigate the folders and files on your hard drive using an application called the Finder. By default, all Finder windows are displayed as icons on a white background. However, you can customize certain color settings in the Finder's preferences and change the background color of Finder windows to black.
Step 1
Open a new Finder window by clicking on the "Finder" icon at the bottom of the screen.
Step 2
Go to "View" in the top menu bar and choose "Show View Options."
Step 3
Select the "Color" radio button in the section of the window labeled "Background."
Step 4
Click once on the white square that appears next to the "Color" radio button.
Step 5
Highlight "Black" in the color palette window.
Step 6
Click on the red X button in the upper-left corner of the color palette window to save the settings and make the background of your Mac's Finder black.