My DSiL is an award winning landscape designer in Vancouver, BC. Here's a link to the porfolio on her website. She does a lot with rock, and the overall look of her gardens is a bit on the wild side. Rock spacing and really organic shapes help that look.

http://www.gardenhabitats.ca/portfolio.html

If you have enough of a budget, the sky is the limit! Have fun with it!

Hugs and butterflies,
~T~