I have seen recently there is a self-paced course on QGIS from the FOSS4Geo Academy . It is hosted on the open source Canvas Learning Network.
There are two modules so far, an introductory one, and a cartography one, with more coming soon.
Following on from my last post, here is the topography of the British Isles segmented using RSGISLib using a minimum object size of 65536 pixels.
This probably isn't a useful approach, since it took the computer about 9 hours to do this. I expect it is better to use smaller objects and aggregate them at the classification stage.
Here the mean segments are colourised using yellow for slope, and blue for elevation with a gaussian stretch as before.
And here are the segments with a random colourisation.
Using a higher resolution (5m) DEM for mid-Wales, around the Aberystwyth, Dyfi estuary and Pumlumon area, aggregating to at least 1024 pixels (that is equivalent to a 160x160m square):