PowerPoint Templates are basically the ready-made presentations that only require texts changes. You are free to change or leave the images provided within each powerpoint template as long as they are within that powerpoint template. In case you wish to modify the backgrounds and other design elements the .PSD source files are also included (Adobe Photoshop required)..
Microsoft PowerPoint 2003 or later is required for editing PowerPoint Themes themselves.
See below my Powerpoint Templates.