Two posts from redbubble on Kashi and Yantras
http://www.redbubble.com/people/shivapurana/journal/12397838-chanakya-artwork
http://www.redbubble.com/people/shivapurana/journal/12397921-about-yantras
http://www.redbubble.com/people/shivapurana/journal/12397838-chanakya-artwork
http://www.redbubble.com/people/shivapurana/journal/12397921-about-yantras