Clone brush and sources panel in Affinity Photo

You can create clone sources to apply pixels from other part of an image as well as from other images in Affinity Photo. You can create all kinds of abstract designs as well as remove elements from images etc
https://youtu.be/nOjcN3Nx1eI
The video tutorial shows how to use the clone brush with multiple clone sources as well as just using the alt / option click to define a clone source in the current document and adding elements from one position to another.