As of this writing wetpaint offers five styles with a light color background in the main text area.

I currently have graphicsgraphic sets loaded for all 5 of the styles with light colored backgrounds:
Club Class, Playful and, Friendly, High Society and Memories styles.

I'm working on more now. You can see samples of the styles by clicking through the links in the navigation window on the left.

Feel free to leave me a comment if you are looking for something in particular.