Use Mutant as Input Picture
Using a mutant as an picture is a simple way to build complex images. With this functionality you can use the output picture as an input picture. This allows you to layer and combine multiple images together.
Pick the Mutant option in the menu and the selected picture will be used as an input picture.
When you repeat this operation you can create complex images with multiple layers.
To preserve the look of your input mutant you may want to use the function Image Lock. In this example the Input Picture 1 is locked and the filters only apply to the Input Picture 2.