Hi,
inspired by a thread asking for a way to create parallel vector curves with different colors, I created some assets which can simplify your live. Intended to Designer / Vector Brushes. Photo lacks the UI to utilize these brushes (e.g. Pencil tool).
https://forum.affinity.serif.com/index.php?/topic/59857-multiple-curves-in-one-stroke/&tab=comments#comment-900033
1. Brushes with 2, 3, 4, 5 parallel lines and a transparent gap between them
2. A gradient Map to re-color g