Originally Posted by After Shock Media

If your even slightly good with your hands what I would suggest to do is to wonder on down to home depot or lowes and get yourself some mdf and some foamcore insulation. I would go with 1 inch thick foamcore myself. Get yourself an x-acto knife or hotwire cutter. Glue the foamcore to the mdf and after it dries (apply weight) take your knife or cutter and shave out your rock/flagstone shapes. Apply a coat of primer to the whole thing then spray paint it with rock spray paint.

If you desire to get even more realistic you can hit up a model railroad or craft supply place and find either static grass or moss to apply to certain areas to give parts a mossy look. Same can be done with mortar and such.

Should only cost you about 50.00 to 100.00 per 4'x8' sheet when completed.