#1
All I've experimented with is ...

EADGBE
DADGAD
DADGBE
DADGCC
CGDGbBbD

I'm pretty good at DADGAD, and standard tuning and drop D are rather basic, and I'm alright at the others. I just want some suggestions for some other cool stuff. I love Andy McKee, Don Ross, Antoine Dufour, Michael Hedges, Tim Reynolds, Dean Magraw, Hannes Coetzee, Craig D'Andrea, and so on, all of those guys, so just shoot me some recommendations.
#2
My favourite open tunings are:

CGCGCE
DADF#AD
Db Ab Db F Ab Db
Eb Gb Eb Ab Gb Eb
Db Ab Db Db Db Db
#3
Quote by tom183
My favourite open tunings are:

CGCGCE
DADF#AD
Db Ab Db F Ab Db
Eb Gb Eb Ab Gb Eb
Db Ab Db Db Db Db


As a slight variation of that, my favorite alternate tuning is C# G# C# G# C# E
My God, it's full of stars!