Since you know those chords already, another thing you can try is to move your chords up frets to create new chords (based on the root note).

This first one uses the E chord, moved up, to create any other major chord.
*note* You can also do this with minor, 7, or any other chords, to change the key it's in.


E F G A
e |--0----1----3----5------<==root---|
b |--0----1----3----5-----------------|
g |--1----2----4----6-----------------|
d |--2----3----5----7------<==root---|
a |--2----3----5----7-----------------|
e |--0----1----3----5------<==root---|


Here's one that's a little bit tougher... using the A chord. If this is too difficult for you right now then try using an Am chord (so all ofyour fingers aren't bunched up into one fret).


A B C D
e |--0----2----3----5-----------------|
b |--2----4----5----7-----------------|
g |--2----4----5----7------<==root---|
d |--2----4----5----7-----------------|
a |--0----2----3----5------<==root---|
e |-----------------------------------|