Watch the Frontiers online guitar lesson by Robbie Calvo from The Rhythm Architect
Some of my favorite guitar parts have been very simple ideas that are very effective in creating a mood. Peter Gabriel is a master of creating pop rock grooves and mood based music. This arpeggiated guitar part is very simple but speaks nicely with the other instruments. I'm holding down the same basic shape on the fret board and moving the upper voicings around to create a melodic hook.
There are so many options available over this kind of progression, get creative and build some of your own.