If you look back through my blog archives to January 2012, you'll see that I was working on a map for my undergraduate mentor who has spent a significant portion of his life in and around what is now the Republic of South Sudan. He liked the map, however requested that I add relief to the appropriate areas. I abandoned the project at the time as the requested changes required design and image editing, not mapping, and I didn't have access to the proper tools.
I've since acquired Photoshop and decided to try to add an overlay of relief to the map, though I'm not sure it's actually an improvement. I need to keep working on my technique.