Two-sided yantra cards, conveniently portable (Kerala, 18th c.?)

Source: ebay, May 2005

A "kalasarp yantra" (early 1900's) to be used for meditation to remove certain astrological problems

Source: ebay, Dec. 2005

"Shri Sammukh Ambaji," an image combined with a small triangular yantra (bazaar art, c.1940's)

Source: ebay, June 2005

Durga carries banners with OM and "Victory to the Mother" in Punjabi, and a small but conspicuous yantra design; bazaar art, c.1980's

Source: ebay, Dec. 2007

"Yantra to exercise control over another individual," by modern Madhubani artists Vidya Devi and Dhirendra Jha

Source: http://www.exoticindia.com/product/DD31/
(downloaded Apr. 2006)