I tried to elaborate some screenshots I took from games I played recently and in the past. Using environments from games with good graphics is another way to create images. My Wacom graphic tablet Intuos Paper Pro is a great tool to do it, even if I'm not so used to draw with it and Gimp. Maybe I should buy Photoshop and try to use it.
Anyway, these sketches are from screenshots I took in World of Warcraft, Fallout3 and LOTRO. Just some little tests.