I don't know what you have tried, but if you feel like experimenting, drop D is a good start. Just tune your low e down a whole step. It is a very common tuning.
I normally frown on this tuning because it is used by a lot of no talent rock and metal groups whose music consists of nothing but power chords, and as if a power chords is too hard to play, they tune in this way so that to play a bar chord you just bar the 4th, 5th and 6th at the same fret. This is just half assed and lazy, and borders on cheating to play guitar in my opinion. Also, I am big on use of the low e in solos and in place of playing the same note a on a lighter string. It gives you a much fatter, more robust sound. Note SRV... When you drop the e, the low side of your penatonic scale solos goes out the door.
Now I should say that I have recently used drop d quite a bit, but for a very different reason than most. I have been learning "Fixin to Die" from Bob Dylan's self titled first album, but this song uses drop d for the low d in the main riff, NOT to make power chords easier.
You can also think of any number of tunings by just tuning your fiddle to any chord you like when strummed open. This is how slide guitars are tuned.