Hello bartschuster,
Introducing myself, I'm developer with 4+ experience with knowledge of Android(Native and Hybrid like Titanium and Phonegap), PHP, Java, Html, JS, Ajax, Jquery.
For Phonegap we can use JQueryMobile or jqTouch for designing. These 2 are just one of easily available designing ways with their JS available as free.
I have worked for clients officially and can no list those app details, but I can build one small sample app with your specifications for proving myself.
Waiting for your positive response and chance for further discussion.
Thanks and Regards,
Chanchal Shelar