Take your favorite circle and visualize it around you. Than shrink it and place it over your heart center superhero style. Than will it to multiply, creating millions of small atomic sized replicas of itself, covering your whole body. This is particularly useful if you have a circle like the the one in the heptameron that invoked specific powers.
The idea for is taken loosely from Tibetan tech of establishing a fortress out of vajras and the armor part of the Simhamukha practices.
Go play and let me know how it goes.