I will endevour to remember to send you a pic as I am able froggy- wife is due to get a DSLR for christmas or her jan birthday. Best way to make it look natural is just don`t pay attention as you do it- then tweak a little- after all you are no lesser a part of nature than anything else! One thing i did do though was kind of stack the high sidekind of with the rocks in a more orginized bricklike fashion with shapes oriented- then started to make it look like collapse by changeing the pile to a bit more diagonal in the rock forms then just kind of like the edge fell to rubble. But as they say - a pic is worth a thousand...........