Roy Bailey uses the guitar as a percussion instrument, banging the rhythm on the strings/bridge, and I do too. But you've got to finger the chords if you do this, otherwise it would just sound awful! The chords I use are:

In the [Am]cool of the evening, they used to gather,
'Neath the [Em]stars in the meadow circled [Am]near an old oak tree.
At the times appointed by the seasons of the [Em]earth and the phases of the [Am]moon.
In the centre often stood a woman,
[Em]Equal with the others and re[Am]spected for her worth.
One of the many we call the witches, the [Em]healers and the teachers of the [Am]wisdom of the Earth.
And the people grew in the knowledge she gave them,
[Em]Herbs to heal their bodies, spells to [Am]make their spirits whole.
Hear them chanting healing incantations,
[Em]Calling forth the wise ones, celeb[Am]rating in dance and song.
Isis, Astarte, Di[Em]ana, [Am]Hecate, Demeter, Kali, [G]Inan[Am]na