How do I fill the area within raster contours with a pattern fill, instead of colors in QGIS? Is this even possible?
Depending on the size of your area you could convert your contour lines into polygons and then colour them using a patterned fill. This might be very slow on a large area with lots of contours. I've tested it using a simple fill on a small area:
Because the polygons will overlap each other you would have to use symbol levels to stack them correctly (See section 2.8 of this: http://manual.linfiniti.com/en/basic_map/symbology.html).