If you've never given yourself the pleasure of browsing the illustrated works of Adam Dedman, please take a moment to do so now. He has a lot of loose-but-intricate linework in the majority of pieces and you can get lost in the details. Once you're done with that, head over to his Vimeo offerings and check out his personal bumper - the same style of impressive line work but fully animated (with sound). It's a great look that I'd love to see in much longer form.