Android has grown very fast. Now, it has many users and also tons of apps in their market. Because Google do not filter apps in their market, there are many half baked apps in there and most of them have ugly user interface. Of course, there are also many apps that have pretty user interface.
Below are few lists of android app that have beautiful user interface for your inspiration. If you find another Android apps that also have good looking user interface and not listed in here, please give me the lists.
This is the official Facebook application for Android. Its user interface is just updated by Facebook and it looks more nice than before.
Google Currents is new app from Google that delivers beautiful magazine-like editions to your tablet and smartphone for high speed offline reading. It will instantly turn your Google Reader subscriptions, or any of your favorite blogs/feeds into a beautiful edition with a magazine feel.
Its user interface use the Ice Cream Sandwich default UI style which is more clean and minimalist than the previous version of Android.