How to Put a Picture on the Desktop in OS X Mavericks
One of the ways OS X Mavericks allows you to customize your Mac is by choosing your Desktop’s background. You can choose any picture you like, for example a portrait of a dog.
Here’s how you can change your Desktop picture if you care to:
From the Desktop, choose app→System Preferences.
Or Control-click the Desktop and choose Change Desktop Background from the contextual menu, and skip to Step 3.
The System Preferences window appears.
Click the Desktop & Screen Saver icon.
When the Desktop & Screen Saver pane appears, click the Desktop tab if it’s not selected already,.
Click a folder in the column on the left and then click a picture in the area on the right.
In this case a picture called Elephant was clicked, one of the items in the Desktop Pictures folder.
You have at least three other ways to change your Desktop picture:
Drag a picture file from the Finder onto the image well (the little rectangular picture to the left of the picture’s name).
Choose the Pictures Folder in the list of folders on the left side of the Desktop & Screen Saver Preference pane and then choose a folder by using the standard Open File dialog. That folder then appears in the list; you can use any picture files it contains for your Desktop picture.
Click one of the iPhoto or Aperture items in the column on the left side of the Desktop & Screen Saver Preference pane.