The G major to C major progression is one the most popular in all of music. It has the strong feeling of resolution you get when a chord built off of the 5th degree of the scale (dominant function) moves to a chord built off of the Root note of the scale (tonic function).
One of the best things about guitar is the ability to easily use guitar tablature (TAB) to quickly learn songs and licks.
This is a simple pattern that lets you explore the 3 note per string pentatonic patterns horizontally on one string using hammer-ons and pull-offs. To me it sounds like something that Dimebag or Zakk would play if they were lucky enough to be as uncool as I am.