Crumbs! I've replied to so many of this kind of harmonics thread that I've pre-written a reply, it's everything I know about harmonics. Url below.

The answer is that with practice you can play pretty big arpeggios even on single strings using pinch harmonics. Whatsmore there are some pretty simple ways to learn their positions etc. It's all below:

http://www.guitartricks.com/2000/trick.php?trick_id=5647

Just so I don't look smarter than I am no I don't know what all the notes are but they're great fun to piss around with!