Rocks made from stuffed brown paper lunch bags, glued shut, spray painted with several stone colors, and textured stone spray paint here and there too...good for many kinds of biblical lessons along the journey.
gold mine stage prop | just a google link, but cool for cave entrances too
how to make a cave!
Mine shaft created for our Cave Quest VBS
Halloween Decorations from the Show
Simple paper, fabric, and packing tape were used to transform the crafts room into a sparkling crystal cave.
churcheventipedia.com - How to Make Rock Walls. Lots of great ideas on this site!