Please go to “Art Theme > Theme Options > Colors” tab to se the colors:
The Auxiliary color is for the Audio player(audio format post), Link box(link format post), Tags cloud widget, Pre tag(HTML tag).
Plain text logo and Tagline
You could define two colors(dark/light) for logo and tagline.
Menu(Menu Item and Icon) on Header
You can define 2 sets of colors(dark/light) for the head menu.
You could define the expanded panel BG color, menu color.