Tectonics map of Maward

[Pixie]

Thanks, Akubra, Naima and Ilanthar.

I really aimed for a clean look kind of style, guess it worked.

The boundaries with the triangles: it's all raster - a lot of lines and 3-sided polygons turned into a selection and then filled with black.
First the black line, done by making small lines after small lines (10 pixels wide in my original large file). Then expanded the selection another 20 pixels and filled in gray in a different layer (underneath). All triangles had to be aligned with that gray area - this is the boring part. Then I filled the triangles and deleted that guide layer. You may add extra touches on the selections like smoothing, feathering, etc. Just experiment. I also added a slight drop shadow to that layer to hide the imperfections a little bit (I think it does the job).