With so much attention given to the left hand when playing guitar, right hand technique is a frequently overlooked. With little or no dedicated attention, the right hand seems to be dragged along for the ride with the progression of left hand technique. What can happen over time is the development of left hand technique becomes limited by the slower developing right hand, and progress as a whole slows to a crawl.
While I do enjoy exercises, the best way to improve on guitar (and make it more enjoyable) is by learning songs. All of the techniques you can practice in isolation can also be practiced within the context of a song. With that in mind, below are 15 song intros you can learn to greatly to improve guitar picking technique.