Here are some cool stone ceremony locations..
photo by Paul Johnson, via Black*Eiffel
image by Colin Cowie via Modern Romance
image from 100 Layer Cake
And for the West Aussie Brides... you too can have a piece of the Cave Wedding action!
The Caberet Cave in Yanchep Natinal Park is a purpose-modified natural cave.. It's about 45 minutes drive from the city, it can seat 110 people or fit 150 for cocktail style reception, and is catered for by the Yanchep Inn
images via bokeholic's flickr and alluneed2know
Good for something a little different, I think it would be a wonderful venue for a cosy winter wedding.. or would probably be nice and cool in summer too