Watch the E Like a Boss online guitar lesson by Brad Carlton from Chord Studies: Rock and Pop Progressions Vol. 1
Four chords all over an E bass groove. That gives you a solid feeling groove for sure! The chords step down, and you are only using two different chord shapes. Try this with a clean sound, with a touch of reverb and chorus - hold the chords down as long as you can before you switch to really get a sustaining sound.