Perhaps you might consider using a rock art icons from some of the rock art contained in the Rock Art in the area which can be found at
http://www.burrup.org.au/If you could match the colours to be more like the earthy red of the rocks (from the rock art area) that would be great. This is the perfect image to represent colours for the logo icon:
http://www.flickr.com/photos/41824528@N00/5046515949/More resources on Rock Art in the Burrup Peninsula here:
http://www.burrup.org.au/Rock_art.htmlhttp://www.standupfortheburrup.com/px/gallery_rockart/GalleryRockArt.aspxhttp://www.flickr.com/photos/41824528@N00/tags/burruppeninsula/Thanks
Si