Here's a list of elements that can be customised in the Dashboard Customize Theme are:

Header Background Color

Logo Font

Navigation Font Color

Navigation Slash Font Color

Navigation Background Color

Navigation Hover Font Color

Navigation Hover Background Color

Navigation Path Selected Font Color

Header Banner Header Font Color

Main Content Background Color

Content Header Font Color

Content Paragraph Font Color

Content Link Color

Content Link Hover Color

Content Unsorted List Font Color

Content Link List Font Color

Content Link List  Hover Font Color

Content Link List  Selected Font Color

Content Ordered List Font Color

Content Definition List Font Color

Content Table Font Color

Footer Bottom Background Color

Footer Background Color

Footer Header Font Color

Footer Paragraph Font Color

Footer Link Color

Footer Link Hover Color

Footer Unsorted List Font Color

Footer Link List Font Color

Footer Link List  Hover Font Color

Footer Link List  Selected Font Color

Footer Ordered List Font Color

Footer Definition List Font Color

Footer Table Font Color 

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