You can decorate screen.
You can use following purposes.
* screen filter for privacy and it has the function that if the application user indicates is launched,
it is temporarily hidden.
So if you indicate camera application, when you launch it, screen filter automatically and temporarily is hidden.
* tag like a "post-it"
Next new revision will include following functions.
* can change images automatically.
・add the function that filter temporarily is hidden when the application that user indicates is shown.
・add the function that save the current filter pattern, size and color and restore it.
・some bugs fix