I apologize if you guys already know this.
I recently got this book called 'voicings' by Frank Mantooth. Great book-def. recommendation. But there are some cool formulas in here for playing poly chords (or alt. chords) in two hands. I'll throw a few out here to see if you like em.
C7(b5) or C13(#11) --- II/I(7) put the 3 and 7 in the left hand (I[7]) and play a D chord in the right (II).
C7(#9) --- bIII/I simply play a C (1 and 5) in the left hand and play a full Eb chord in the right (bIII).
C7(b9 b5) --- bV/I just play a C (1 and 5) in the left hand and play a Gb chord in the right (bV).
C13(b9) --- VI/I(7) You place the left hand on 3 and 7 of C and play an A in the right hand.
C7(#9 #5) --- bVI/I(7) play the 3 and 7 of the C dom. and put an Ab in the right hand.
But it gets really fun when you start playing the blues and alternating your right hand between the chords and creating interesting melodies. Man. If you haven't tried it yet, do so right NOW.
peace

-nick