I know my theory is getting rusty, but think about what you did, basically you played a large D Maj 7, probably had that big piano sound didn't it, just try more of the same, and maybe try other chords that share 2 notes together, D and Bm or Bm7, or break it up and play combinations of double stops together, just a quick thought, I'm sure the gurus will be here shortly to offer enlightenment very soon.........................