How we allowed users to customize the look & feel of our app with only 4 options

How's adoption of the customization looking? Curious to hear if this is resonating with people or if four options is not enough...or too many.

I'm totally lost as to what this does from the page, and I'm not going to use a bookmarklet for something I don't understand.

Please please please do not make links with just the word "here" linked. That's usability and SEO horror.