Name the Coolest UI/UX and Applications that Android can offer?

Hey guys I am a new user of Android.

So I have been looking for apps that really play to Androids strengths or have very clever UI/UX. So less traditional buttons, more gestures, flipping, sliding panels.. for example.

What do you all use everyday because it is plain awesome to use? [but not at expense of functionality]

Examples of what I have found so far :

Snapspeed, Evernote & its widgets [excellent], Dolphin, Pixlr, Flipboard, Million Moments [below, very cool album maker, nice gestures] are all kinda what I'm talking about. I've been messing with APEX launcher as well.

Sony-million-moment-01-480x413_medium

Please name and describe the best you use!

Bonus if you attach a picture of the UI. Thanks