don't forget "harp" harmonics! you can fret a note, say 3rd fret high E string, normally, then, with this note acting like an open string (sort of), use your right hand's index finger to lightly touch the string over the 15th fret (one octave) then pick....this is more of a classical guitar technique and is quite similar to a pinch harmonic, except getting a pinch harmonic to SOUND on a nylon string guitar is hard to do

another method is to fret normally and TAP with the right hand an octave above the fretted note...this is fun for doing chords...fret an open E then tap 12th,14th,14th,13th,12th,12th frets from low to high...

oh, and you can do vibrato on a natural harmonic :P just manipulate the string behind the nut...and wiggling the guitar around can work for ya too

peace