What U've just explained is called..mhh, lemme see...Whole Tone Scales! (I stand to be corrected if I'm wrong
).
I remember Hammondman! started a thread on them a few months back..
HERE.
I'm not a cat yet, but I guess I always fall back onto the
chromatic scale if all fails..2 ways to play it:
i) Play everything really fast up & down; or
ii) Arpeggiate everything & play it slowly
now that has no specific key, right?
Another thing you could do is play the Chromatic scale as ditones ..so start from C:
C-E/Bb-Eb-Ab
Db-F/B-E-A
D-F#/C-F-A# [note: the boldened part is your ditone if you don't know (ie, 1-3 of any major scale) you could also do something with semi-ditones (ie 1-b3 of any major scale)]
& I leave this part open to you to either carry on up the scale or go around the circle of 4ths or 5ths.
so as 1 of the many possibilities, you could go up a 4th: so from the D to G..So..
B-G/Bb-Eb-F (i don't know if this is still a ditone Plz help..Does the way I've inverted the B & G change the quality of a ditone )..Another thing you could do is play tritones on your LH with any other chords on the RH.
My take on all this though is that it will tend to resort to 1 or 2 keys, unless if you leave it hanging there.
I got2 hear what the theory minstrels have to say on this 1..
Very interesting thread indeed.