Over a 25 years years I’ve experimented with a lot of open tunings. originally I was inspired to do this after hearing John Martyn, John Renbourn, Stefan Grossman and then a few years after that, Michael Hedges, Pierre Bensusan, Alex de Grassi and of course Nick Drake.
Finding material to play in normal tuning is easy these days, but getting a good range of tunes is not so easy in some of the other tunings. what I’ve had to do over the years is create my tunes or rejig other tunes to suit.
A few weeks back , I was listening to an album by Anouar Brahem, the Oud player from Tunisia and the Norwegian sax player and I decided to arrange a piece of music in a version of C tuning, it’s C G C G C F from bass to treble. you’ll finfd the TAB and music notation at http://the-guitarplayer.com/?p=72 it’s very simple and short but a great piece to work with.