Lately, one could say I've been experimenting with chords... Though I've really been experimenting with intervals within a synth patch...
If you listen to a lot of the sounds Noisia, Misanthop, and Phace have been toying with over the past year or two, and 16BIT more recently, it sounds to me like they've been making some interesting synth patches with melodic upper intervals. For instance, playing with the fifth above the first octave register would have OSC1 at root, 0, and OSC2 at +19.00. Experiment with different intervals on your SYNTH bass, not your BASS bass... i.e. Don't ever fuck with your sine, you want that mono. I'm talking about your 120HZ+ synth bass that might be a lead or some wobble shit.
If that's not sounding right, try modulating the amp of the upper interval. When you pluck a guitar string, part of what defines that overall timbre, which distinguishes it from, say, a piano, are the overtones that increase in amplitude overtime. Try thinking about that when you play with the amp envelope of that upper interval, or overtone, so that it is separate from the amp envelope of the root tone.
Just a thought. This has produced some new and interesting sounds for me.