You probably know this one,but "dropping" your "low E" string to "D" you can then do "one finger power chords",meaning instead of two fingers to do "first/5th/first octave",by lowering the E to D,now those 3 notes,are "you guessed it" 1 finger!,on the 3 lowest strings,1 fret-1finger.
A good example of this is an Alice In Chains song "Them Bones",the entire "rhythm part"of this song is played using this technique.
Then again,what I'm suggesting,probably has "absolutely nothing" to do with what your hoping to achieve!
Bob