VMuikit is a Joomla component that install a override theme for Virtuemart. The component also adds a lot of extra settings to customize your Virtuemart/webshop setup. All the layouts/overrides in VMuikit is based on the UIkit framework from YOOTheme (all YOOtheme templates are built in UIkit framework).
The UIkit framework gives endless of possibilities for web designers to customize the look and feel of the website/webshop.
The full potential is that with one of YOOthemes templates you can actually build so many different webshop/websites with completely different look and feel (design and user interface). Are you serious about web design you should really give YOOtheme templates a go. Check out their templates: http://yootheme.com/