Here's a couple for you that i've picked up along my way
Power Chord - a fair ammount of guitards will use these as rhythm
A B E
G--------------
D---7----9----2 (octave higher of the route note)
A---7----9----2 (fifth of the octave higher)
E---5----7----0 (route note)
Really Simple. Use your index to create the route note, and then middle, (and ring if needed) to do the other two notes. This works well becase You play the route note, an octave of the route note, and then a fifth of the octave higher (i think that's right, i'm not too hot on theory)
An adaptation of the Power Chord i've been playing around with (don't know if it's an actual chord) is to take the octave higher, and move it up two frets
A B E
G--------------
D---9----11----4
A---7----9----2 (fifth of the octave higher)
E---5----7----0 (route note)
Works well in some cases, not so much in others... just play around.
Here's one i like to throw in occasionally just instead of a simple route note.
C E
G--5---9----- (Octave above route note)
D--2---6-----
A--3---7----- (Route Note)
E------------
Try arpegiating (playing each note of this chord separately)
G--2-----------2
D--3---------3--
A--5-----5------
E---------------
a simple 4-note pop-punk song can become quite interesting when arpeggio'ing that chord.
See example:
G------------------------------------
D------------------------------------
A----------5-5-5-5-3-3-3-3----------
E--5-5-5-5------------------0-0-0-0-
Can then become
G-----------------1--------0-----------
D--------1-----3--------1--------------
A-----3-----5-------3----------------
E--5------------------------0---2-2-
Simply using 2 of the chords taught above you can turn pop-punk into pop-funk
Hope some/any/all of this helps!
EDIT: wanted to add more;
If you find yourself slapping on the E string, try this one
G-------8----4---6 Power Chord with the octave (remember that one from above?)
D-------6----2---4 Octave of the route note
A-----------------
E----44---00--22- Route Note (double slapped)