Aside from looking way better out of the box, the new Extropy skin was some advantages over the old default skins. The most obvious difference is that the skin is based on <div> tags and not on a <table> layout. The next most obvious differences is the skin is using SkinWidgets as you can see with the new "toolbox" feature.

The new feature is very cool, but should be used more as a learning tool for DNN Skin designers and developers as it doesn't work in the "anticipated" way a user would expect in a production environment.
As expected, clicking on an icon does indeed change the settings of the current page. (However, you'll notice that not all the text changes in response to the text changing icons...this can be fixed with some good CSS style sheet modifications though. It is a limitation of the stylesheet and not the widget)
But. . . it does not work as "anticipated" because when I (the user) navigate to another page, the page will revert to the default skin unless I've elected something different. So, technically a user would have to make selections on EVERY single visited page before their preferences would be shown to them.
So, while TECHNICALY the feature works as designed, it doesn't work as ANTICIPATED for the end user.
There is good news however, if you're looking for a module to do something like that...
Shameless plug begins here. . .
The veCSSViewer module allows you to use one skin (.ascx) file and add as many stylesheets as you want for it. You can add a visual cue or image to represent each stylesheet and you. ( Check out the demo here )
As the portal admin, you can decide whether you want the preference to work on one page only or for the entire site. Preferences for registered users are persisted for the lifetime of the module and preferences are even persisted for anonymous users for the lifetime of their cookie. You can visually control your site's look and feel and offer your users a special treat to personalize their visit. If you want to see more just visit the module on Snowcovered or on Virtual-Essentials.com.
OK... shameless plug over...