I love the design and coloring. The use of pictures for the activities is much more appealing than text like other similar apps.
UI inspiration: Great App & Web Designs | From up North http://allsolutionsnetwork.com/cgi-bin/d2.cgi/UL5489/moremoney.htm
Flat iPhone iOS 7 - Mobile App Bootstrap UI
Full-pixels Nice to have options in hidden panel that shows when moves to the side.
contact list see: http://dribbble.com/shots/876515-Search-for-friends-list?list=searches=notifications
Messy Tomato Mobile App
QuizBit | App UI Design on Behance
Just an Android app prototype of simple sidebar menu with selected messenger option.
MetroLite App by Alex S. Lakas , via Behance
Bland color palette aside, can quickly identifiable primary vs secondary info // Squarespace Blog