Revisiting this, nothing as complicated as the previous showings but sometimes comes up in Gimp 'how-to's
A bit of preparation required for the target path, this was hand painted then center-line traced. Might have been easier just to draw the path straight in.
The pattern the half-moon and the base path to create an offset. This moved for the three offsets. Each path filled with different colour.
...and yes, a bit of hand-painting at the end(s) to tidy up
edit: with a bevel and a drop shadow.
A bit of preparation required for the target path, this was hand painted then center-line traced. Might have been easier just to draw the path straight in.
The pattern the half-moon and the base path to create an offset. This moved for the three offsets. Each path filled with different colour.
...and yes, a bit of hand-painting at the end(s) to tidy up
edit: with a bevel and a drop shadow.