Note - Click here to Add Clip Art and Pictures in PowerPoint 2007
Use A Content Slide Layout
PowerPoint 2010 offers you a number of different ways to add clip art and pictures to a presentation. Perhaps the easiest way to do so is to select a slide layout that contains a placeholder for content such as clip art and pictures.
On the Home tab of the ribbon either click on the New Slide button or change the current slide layout by clicking on the drop down arrow beside Layout.
There are a number of different Content slide layouts available for you to choose from. To add a single picture or a piece of clip art, click on a simple layout such as Title and Content and the layout of your current slide will change to match your choice.