2. filter >; Twist > glass, set as follows.
Then the picture is as follows.
3.Q key exits the quick mask, and we get a choice.
4.Ctrl+shift+I deselect and create a layer at the bottom and fill it with white.
5. In this way, a simple border is finished. In the second step, you can also apply other filters to achieve different effects.
Filter > pixelation > color halftone.
Filter > distortion > ripple.