I just came back from an amazing workshop in S. Florida, Highland Beach. This was the first time many of my students made a yantra, and they chose to create a mandala around it. The mandala is made from an ancient number grid called the Vedic Square. There is not that much known about it, only that it has been used to created intricate designs and patterns and when you look at it, it's some kind of multiplication table.
Students picked their yantra based on their personal numerology, ascendent lord of their vedic astrology chart or dasha lord. Some people combined a few of these elements. Here are some examples of their work:
Mavis Gewant, Sacred Artist & Doula reflects on life