Tutorial:
1) Download PS4 Theme Editor
2) Unzip and install the editor, then open it
3) You must load an existing theme to use as a base. The developer provides a theme here
4) Click "Load" in the main menu (if it appears in Japanese on your computer, this is the second link in the screenshot below)
The theme settings can be changed in the right pane. The images inside the theme can be edited / replaced in your favorite image editor (they are in the texture subfolder of the theme)
You can save your work by clicking on the last option (ä¿å˜) in the first menu.
DOWNLOAD : PS4 Theme Editor