I'm talking about unorthodox guitar-like instruments or who play a standard guitar in an unstandard way, such as different tunings. (I'm not just talking about changing one string's tuning, like dropping the low E string to a D for certain classical pieces or tuning up the G string for slide guitar, but altogether different tunings). Or it could even involve approaches to the guitar other than plucking strings with fingers or picks, like Michael Hedges, Preston Reed, or the amazing way young female jazz guitarist Kaki King slaps the strings and the body of the guitar to get some wild sounds.
It could include playing a 7 string or 8 string (I believe Ibanez came out with an 8 string not that long ago) or more strings. Or a fanned fret guitar like a Novax. Or smaller or larger members of the guitar family, like a Requinto, which has a brighter, crisper sound than a standard guitar, with a 535mm scale tuned A D G C E A.
It could involve tuning a guitar in major thirds as some guys have experimented with (jazz guitarist Ralph Patt
http://www.ralphpatt.com/), which can be very interesting or other non-standard tunings such as the New Standard Guitar Tuning used by Robert Fripp of King Crimson (C(6th string) - G(5th) - D(4th) - A(3rd) - E(2nd) - G(1st).
I have a both a 7 string electric (Ibanez) and a 7 string classical type of guitar. On both guitars, the top string is a high A above the high E. It lets me hit the same chords as my 6 string but with the ability to get to more notes in the same area of the neck for bits of solo. On the nylon string guitar, I have some nylon fishing line (40 lb. test) for the high A and it doesn't break and sounds very clear. For the electric, I use a .008 Thomastik-Infeld string for the high A, for which I solder the string winding with solder which helps to keep it from breaking. I haven't shifted all my playing over to this configuraton but I pick them up often enough to be comfortable with a high A and I've adjusted to seeing it there. It's really not that big a deal.
For anyone who has experimented with something other than a standard 6 string or standard way of playing a 6 string, what are your experiences? Is it something you've just played around with or have you actually shifted most of your playing over to that and developed a new style? If so, has playing that guitar or guitar tuning really changed your sound and your style in a positive way and how? I'd be curious to know.