And for fun, an exotic jungle drawing tool.

Here are the fills I have made, using the method outlined by Ralf. I have put them in my Mike Schley drawtools.

I wanted to create rocky wastelands for smaller regional maps.

Here is the drawtool page, and the examples.

I have also used a pattern to overlay the underlying fill, to create a further distinctive wasteland fill, for use in much larger maps.

And the symfills I created:

Looks fabulous. Well done.

The swamp doesn't have to be humid - plenty of swamps in the tundra regions of earth.

Love the compass

But for reference, here is Ahab, my beloved Schipperke (Belgian barge dog - all black with no tail).