I'm not an expert on this, but I was told by an "expert" that you can just arpeggiate your chords--hmm, is that a word? (I think so.) Anyway, I guess using this you can take a chord that you'd normally play and just play the notes separately.
Inbetween chords, you can
Arpeggiate the chord tones and extensions of the chord tones individually like B3 said. You can also play the
Extensions to the chords (7th, 9ths, 13ths, etc. ),
Inversions of the chords,
Substitutions for the chords or even just play the melody. You can also do something with the rythmn.
Look through the old posts in the THEORY, PIANO and LOUNGE forums (and also at
http://groups.google.com) for the words that I
bolded (is that a word ;-) ) and you'll find a bunch of ideas. Play around with some of those and let your ear be your guide.
- James
.