Coursera is a nifty app for you to access college courses on your phone. Gone are the days of massive student debt and physical classes (just kidding; both are here to stay). I'm not kidding, though, when I say that the free lessons provided are myriad and interesting.
Believe it or not this live wallpaper will not drain your battery life like any other live wallpaper do. Simplistic and Highly Customisable, definitely go check it out.