Here are a couple of things I've done when I'm not working on "serious" stuff (concept work for video games). These latest sketches pretty much revolve around me pressing every conceivable button in either Photoshop or Painter, always looking for that "magic" button. As it turns out, there are several of those (or rather, you need to find the appropriate combination of buttons). They can make shit shine.
If you have any questions regarding any of these feel free to ask. Hope you'll enjoy them, and I'll try to maintain this thread to the best of my ability
EDIT: Oh, and that linesketch is not mine, it's the work of the awesome Joakim Hellstedt. He kicks ass, and his drawings rock. He let me put some color on to that linedrawing, so I thought I'd include that here.