Things like this one: https://www.shadertoy.com/view/Xl2SRd , For fade in/out.
Also the typical horizontal/vertical bars or the diagonal dots,etc... or the basic ones like simply showing the image from up to down in 1px with at a time.
Examples:
https://i.ytimg.com/vi/wO5LP5lqxxs/maxresdefault.jpg
http://i.imgur.com/8lMX9X7.gif
https://0.s3.envato.com/files/1409260/R ... 90x300.jpg
Here a game that uses a lot of them:
So, will be great some plugin/effect or whatever to do this effects on layouts or simple images.