CONTRAST.

http://www.redicedesigns.com/rainbow_background.jpg

In contrast to this website, the ultimate verdict is that it's a bad design. It's designed so poorly the it's hard on the eyes with the rainbow effect. Since there's so much going on, you don't even know what to read first, giving me, and anyone else who is reading it a headache. Whoever designed this must of just threw everything together, and posted it up.

http://www.sitepoint.com

Contrast in my opinion creates focus, so in this photo, it does just that. This spread used contrast, balance, and organization to produce an unusual, striking image, making it work well with the reader. The heavy black type also adds nice contrast to the lighter body of text, making it pleasing on the eye.