As an experiment, I was trying to look for options available to improve default look & feel of the cordova application. After going through various blogs and forums, I realized that there are various options available to choose from. After visiting each of these options, I thought to gave a try for onsen.
Onsen is primarily based on AngularJS and extends HTML by adding its own tag definitions. For the behavior management, framework utilizes AngularJS. The website has plenty examples to try out, various controls that come with Onsen. Primarily Onsen has very rich set of components and it has been backed with good documentation.
While the default look & feel of Onsen is very rich, the framework also comes with themes. To change the theme, just change the CSS declaration and you are done. This gives an added option of branding the application as per business requirements. You can leverage Theme roller to customize the settings and download the theme.
Visit Page patterns to see the demos yourself.