Ooh I have a list somewhere of cool tunings, I use tons
Here we go: (low to high)
DADF#AD
DGDDGD
DADDAD
DADGAD
EADF#BE
EADEBE
EEBABD
GGDGBD
CFCGCE
CGCFCE
CFCFCF
C#F#C#F#BbC#
CGCGCE
Most of them are pretty common actually (a bunch of them are just Nick Drake tunings...

), but I suggest GGDGBD, DADF#AD and CGCGCE specifically for the coolest sounds
Edit: to clarify, the notes that are the same (i.e. GGDGBD) are in the same octave