You can change the color skin to be virtually anything!! All the background colors, gradients and highlights will adjust to fit your chosen color. You don’t need to change the color in a PSD file, slice it up, etc.
To change the color skin, go to Appearance ->Theme Options. It’s the first setting in the General section. Simply choose a color from the color picker. (Color picker is available in version 2.78 and newer)
The headings on the whole theme will also change to your skin color. If your chosen skin color is very light, then some heading text will be difficult to read against a light background. In this event, the next Theme Options setting “Alternate Text Color Scheme” is there to help out. Choose a darker color so that text will show up better against the light background.