WordPress site-styling is template driven, changing the way your sites look & feel is as easy as finding a new style FTPing it to your themes directory and enabling the style from withing WordPress.

Here is a list of theme resources I have found useful

WordPress.org

Smashing Magazine Post – 83 Beautiful WordPress Themes You Probably Haven’t Seen
Smashing Magazine Post – 100 Excellent Free WordPress Themes
WP Themes

Individual Designers

Design Disease
Evan Eckard

Background Patterns

DinPattern

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