I stumbled across an interesting displacement technique that’s useful for subtle parallax type effects and ripple distortions. Using this technique, you can add movement effects to still images such as clouds to give them the appearance of movement as the camera travels over them.

The above video talks about the technique, and I’ve added a simple Node Group I developed for it up for download at Gumroad and Blender Market.

Blender Market: https://blendermarket.com/products/2d-displace

Gumroad: https://gumroad.com/l/2d-displace