Familiar chords can still sound distinctive
You do not need complicated harmony to write an indie guitar part. A progression such as G–D–Em–C can work perfectly well.
Instead of immediately searching for more unusual chords, change how you play the progression. Let open strings ring, move part of the progression higher on the neck, play triads instead of full chords, or change from arpeggios to strumming between sections.
The guitar arrangement often matters as much as the progression itself.
