I assume you mean open tuning, Susan...I use a double-D tuning in which the two "E" strings are dropped down to D, D-A-D-G-Bb-D. This is line an open "E" chord but a whole note lower.

Anyway it is very handy for open chords, just barring on the 3, 5, 7, 8 frets, making a bluesy sound with raga-like overtones. In addition you can always add a twang by adding the high E on the third fret, and there is an endless array of sliding pairs you can use.

In addition there are a number of fingered chords in this tuning which carry well up and down the scale, and harmonics sound rich and resonant especially when you tune a 12-string this way.

If you look for some of the earlier threads on DADGAD and related tunings-- by Rick Fielding especially -- you'll find a really rich trove of knowledge.

Regards,

Amos