bhakta=poet wrote:If the metaphor of Indra's Net is in fact borrowed from the Vedas, can someone tell me where in the Vedas this originated?
A net is one of Indra's weapons in the Vedas. The Vedas themselves do not present the Indra's Net metaphor like the Avatamsaka Sutra does. But it is implied, because Indra uses his net to control the cosmos. Indra is very well interwoven in Mahayana and Vajrayana symbolism, i.e,. the Vajra, along with the bow (Saraha) and the hook (rarer but various yidams have this).