Things You'll Need
Instructions
Downloading from the PlayStation Store
Downloading a theme from the PlayStation Store will automatically apply it after download is complete. If you have downloaded multiple themes the last one downloaded will be applied. Your themes will be stored on the PS3 and can be changed at any time.
Navigate through the XMB and select the Settings menu.
Scroll down to Theme Settings and select Theme.
Select the stored Theme you wish to use and apply it.
Downloading from the Internet
Download a file with the .p3t file extension and save it to your computer.
Plug an external media storage, such as a USB drive, into your computer and create a new folder labeled "PS3".
Open the newly created "PS3" folder and create another folder within it named "THEME".
Transfer your p3t file to the "THEME" folder on your storage device and plug it into your PlayStation's USB slot.
Go to Settings>Theme Settings>Theme>Install and select the USB drive. The PlayStation will show all theme files on the storage device and you can install any of them one at a time.