I know a little bit of basic music theory, and I can play any power chord and know what key I'm playing in on the neck, as well as a large amount of the notes on the fretboard. In my entire time of playing guitar, however, I have hardly touched on chords. I can play most open major and minor chords but nothing more than that.

The stuff I play is usually improvised and created by feel through free form music creation in conjunction with varying techniques for phrasing and modal patterns and scales I have learned throughout the years. Most of what I play definitely comes out in a...darker, meloncholic form of neoclassical/romantic expression. I know the locrian mode produces a darker sound, as well as most harmonic minor scales.

What I want to do is learn some unique, dark sounding minor chord progressions, any help and advice would be appreciated.