Extremely beautiful work/creations Erisian.
Utterly peaceful.

I suddenly realised that there was a relatively painless way to create concentric patterns with the PSCRSW filter.

Step 1:
Start a new square image and add your background colour.
Step 2:
Create your walk path as a diagonal.
Step 3:
Create a simple copy path near the top or middle of the image.
Click on another tool to leave path mode - or press hotkey M for the Move tool.
Hide the path by clicking on the eye in the paths tool dock.
Step 4:
Call up PSCRSW.
Set the Rotation angle option to 15.
Set the Force full revolutions option to 'Yes'.
Set the Number of repeats along walk path option to 1.
Click on OK

Below: Copy Path image on the left - Filter output on the right.


Step 5:
Duplicate the copy path in the paths tab list and make it visible.
Press hotkey B to enter path mode and click over the duplicated path to reveal the path anchors.
Click to add a new point to the duplicated path (see the image below).
Hide the path by clicking on the eye in the paths tool dock and press hotkey M for the Move tool to leave path mode.
Call up PSCRSW.
Change the Rotation angle option to 10.
Click on OK

Below: Duplicated Path with point image on the left - Filter output on the right.


Step 6:
Repeat the process...

Duplicate the original copy path in the paths tab list and make it visible.
Press hotkey B to enter path mode and click over the duplicated path to reveal the path anchors.
Click to add a new point to the duplicated path but move it further away from the body of the main path than last time (see the image below).
Hide the path by clicking on the eye in the paths tool dock and press hotkey M for the Move tool to leave path mode.
Call up PSCRSW.
Change the Rotation angle option to 5.
Click on OK


Below: Duplicated Path with point image on the left - Filter output on the right.


If you want to be more precise you could use grid points to help with the spacing and if you want to keep going you could always zoom out and place a new point off the canvas.

Thank you Erisian for "pipe brush".
Thanks to Skinnyhouse for all the detailed explanations and screenshots.

Version 0.03 on GimpLearn fixes a zero walk path length bug introduced in version 0.02 spotted by Krikor.

Version 0.03

With G'MIC stylize


They make interesting height maps too.

Beautiful work everyone. Not tried any of it yet. Can't be bothered at the moment. Love looking at what you all do.

Erisian, strange effects.
As sallyanne, I will start my tests with the latest version and the last explanations when I have a quiet day without constraints.

Erisian, this last one looks very complex to me! How many different patterns or individual images did you have to make to complete it? I love it!

I ran the paths plugin, then G'MIC extrusion (I think that is what it is called.) After that I duplicated the layer, flipped it and put it into a layer mode - I think grain merge. I merged it down and colourized it before adding a gradient as a background. I'm never good at remembering how I do things but I think I got all that right.
I'm glad you like it anyway.

Erisian - I like the beach sculpture; reminds me of some works I saw on the Normandy beaches a few years back.

Erisian & OMG:
Running the filter is one thing but using the output in a creative way is your forte.
Love the results you both produce.

Updated to provide user start angle and more options for applying colour and part revolutions on GimpLearn:

Version 0.04 Update

An example using alternating reversed gradient and some three-quarter rotations...

Skinnyhouse - thank you for your comments but I just cannot keep up with your new options; I'm still trying to work out some of the originals.

All part of the fun OMG...

I'm having the same problem as OMG. You're updating them faster than we can explore them.

From this evidence you don't seem to be having too much trouble - unless you're just winging it.

Erisian - excellent and imaginative outcomes; well done