I originally saw the technique for creating diamonds in a book I bought in Japan. But it was still a little bit tricky figuring it out, because (a) the book used the Japanese language version of Photoshop, and (b) I don't read Japanese. Since then, I've seen the effect used numerous times in ads and on CD covers, and here we're using it as part of a fictitious hip-hop radio station logo.
Quick Tip: Moving your image when in Full Screen Mode
If you're in Full Screen Mode (no menus, no palettes, no tools, and your photo is centered on a black background) in Photoshop CS, you can now drag your photo around within the black canvas area. Just hold the Spacebar and your cursor will change from the Move tool to the Hand tool. Now you ...