Board Thread:Questions and Answers/@comment-16500037-20130825195958/@comment-4621372-20130827160119

Bascially, you take a map from wikipedia, you go to some photo editor. I recommend Pixlr; it's free, no download. GIMP works better if you're fine with download, and of course Photoshop is overall the best, if you are willing to pay. But for maps, there's no reason to; go for GIMP, Paint, or Pixlr.