Tiny, red and toxic
I used to think that the tiny red and black seeds of the Abrus precatorius could be found only in Guruvayoor, the temple town in Kerala. I used to think these seeds existed on earth only for toddlers to play with them in front of Lord Krishna, where he could watch them and revel in their delight. Of course, the kunnikuru is more widespread than that, even though it is not native to India. It was only much later that I learnt that A. precatorius is considered a weed; in days past, they were supposedly used by goldsmiths to add lustre to the ornaments, though I don't know in what way. There is also a belief that each of these seeds weigh absolutely the same (about a tenth of a gram) - that was useful for jewellers to weigh their ornaments against these seeds. These shiny seeds were also themselves used as jewellery beads, too.
Nature, however, has a different take on the significance of colours; bright, shiny red indicates danger, more often than not. In the case of these seeds, it holds true. Harmless when whole, the broken seed releases a poison. So, even if you wander into this thicket to pluck these tiny seeds, make sure you do not chew on them, for the poison released can be fatal to humans.
No such worries about the young children playing with these seeds at the temple - they know better than to pop red seeds into their mouth, because that is the way nature made them!