Is there a marker available anywhere for point pattern fill that resembles the standard wetlands symbol used in USGS topographic and other maps? Any good standard symbol that will be intuitively recognized as wetlands?
Have a look at the OSGeo map symbol set list:
they list a bunch of resources where you can find symbols that are free to use. There is also a link to the USGS topo symbols. If you come on a day when there is no government shut down you might find what you are looking for there or browse the other lists from OSGeo.
You can try this:
- Install free photo editor app such as GIMP
- Install SVG plugin
- Find a free image web site showing a wetland symbol and take a screen capture of it
- Open GIMP paste in screen capture crop image and export to SVG
- In QGIS go to your wetland layer properties>Style>Change, select SVG fill for Symbol layer type and browse for your saved wetland SVG