If you like the look of stonework but the project is daunting, consider faux stone veneer. It looks exactly like real stone, but it's 75% lighter. Stone veneer can be applied directly to most surfaces, including drywall, concrete or brick - indoors or outdoors.
This site has instructions and videos on how to create your own Fake Rock Walls, Bridges, Waterfalls and More for your pet's habitat. Projects range from beginner to expert level :) PICTURED HERE: beginner level bridge / platform project.