I'm not any good with Photoshop myself, but this article on Designer Daily has links to fifteen different steampunk-based Photoshop tutorials. Judging by the images of the finished products, they look really amazing!
If you're into steampunk and aren't intimidated by Photoshop like I am, I think you owe it to yourself to check these out. Here are some of the images you can create by following the tutorials:
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