Stark contrast example of Data Viz — leveraging light & dark backgrounds to showcase data. Also, looking at the corner-radius of the containers and custom typography to make things look more 'appy'
Snowfall Widget (mobile website) | http://dribbble.com/shots/637351-Snowfall-Widget-mobile-site
Weather Glass: by JOMMANS: a concept little desktop weather widget #UI
Not a fan of UI "kits," but this is a nice idea.
Information Dashboard or Widget User Interface
Time. The design of these clock hands is unreal!
Flat Music Player (iOS) by Michal Langmajer