Boy, this is a fast-growing thread! New here, so please no flamage.
Regarding pre-christian imagery in Britain: Sheela-na-gigs, green men and so on were definitey relevant in different ways at different times as the cultures that viewed them changed. If Christians carved 'em, then they had meaning as christian symbols as well as any older, traditional associations. Also, local deities and spirits were not only revered by locals, but often propitiated by travellers and foreigners who were just passing through. After all, Britain has had a lot of traffic in the last 2000 years or so -- such "local" imagery might have been incorporated from Romans, Vikings, Saxons, Normans, Picts, you name it! It's not like there was one culture throughout britain in pre-christian (or even post-christian) times.
'Nuff said about that (What a mouthful!). What I really wanted to talk about was pagan music. I've been in circles where recorded music was used (lots of Doors tunes), but the best experiences were when we all sang together.
Diana Paxson and Adrienne Martine-Barnes wrote a number of truly beautiful goddess hymns for the Liturgy of the Lady, a ceremony that drew on Christian ritual but centered on the faces of the Goddess rather than the God. I think the Fellowship of the Spiral Path out of Berkeley still has copies, but they rarely perform it anymore.
I don't know the url, but they've got a web site somewhere... Hope this helps!