From NearSeaNaturals, click for the story of how lovely they are. A little digging around on the internets turned up this on a Nepalese and Tibetan Arts blog:
“The golden fish symbolizes happiness the auspiciousness of all living beings in a state of fearlessness, without danger of drowning in the ocean of sufferings, and migrating from place to place freely and spontaneously, just as fish swim freely without fear through water.”
I like that. They would make smashing coat buttons.