again i recommend theory. Theres a wealth of chords....not really exotic but beyond basic that you can construct easily just from rudimentary music theory knowledge. major and minor 7th chords and 9th chords are basic but will break you out of that rut. I wouldnt recommend a certain progression as thats just another rut you will fall into. Just learn the above chords and try mixing and matching to find sounds you like. 7th chords can be very jazzy or blusey. Dont just learn shapes. Get a book and see exactly how they are constructed. Then you can create chords in any position on any root note. Theory theory theory! I always relate people who refuse to learn theory to britney spears. They may sound and look good but they are dumb as a post.