I've used this for several projects. You may find it easier than trying to carve. It's available in 3 sizes, random or cut stone.
www.walthers.com
Flexible Cut Stone Wall with Self-Adhesive Backing -- Small Stones - 1
Fully detailed and painted, these flexible stone walls are easy to cut, curve and form. The interconnecting design and peel-&-stick backing makes installation easy so you'll have a realistic wall in no time. Walls are available in several stone sizes to fit your layout. Random Stones Small...
