This set of source files uses the 36 seamless checker patterns and the lace brushes for intricate patterns using the Appearance setting. It allows you to combine and layer different strokes and fills to create more complex setups. These can be saved as styles and easily reused.
Here's a youtube tutorial video on the creation of designs like this:
The source file is compatible with Affinity Designer v1 and v2.
Affinity Designer source file- intricate designs using multiple strokes on one object