Watch the Triads online guitar lesson by Angus Clark from Hard Rock Survival Guide: Rhythm
Okay, that's been a good bunch of stuff on power chords and riffs. Let's lighten things up a bit and look at stuff we can do on the top four strings, shall we?
This lesson is kind of in depth, but understanding triads and basic harmony is absolutely essential to coming up with cool rhythm and color parts. This kind of facility will allow you to diversify immensely.
I mostly play my triad shapes across strings 2, 3, and 4. I wind up playing them on 1, 2, and 3 fairly often as well, so we're going to look at both. If you really want to get this kind of thing happening, you need to do all of your chord scale and inversion studies across all string sets and in all keys. I encourage you to do that, it will help both your rhythm playing, soloing, and general neck knowledge. That level of depth is outside of the scope of this "Survival Guide" format, but I think that kind of knowledge is fundamental to being a guitarist. So go forth and google it.