We've recently added a new cool feature - the ability to add custom gradients, gradient backgrounds and rounded corners under any element on a mobile site (forms, links, buttons, image galleries, widget headers and widget content areas) - all without any CSS or HTML editing.
You can also adjust spacing (padding) arround any element, highlight individual links or headers with a unique color or gradient, and have more control over the look of the mobile pages in general.
Just click on the Style icon next to a widget on the page - there are a ton of options there to be a true artist!
See the example on the left and visit http://spa.pijnz.me/ to see this page in action (note, this is a demo page, and the link there are not functional).
Watch this 4 minute video on how this is done: