Holy Spirit, Soul Reaching Peace, Spirituality. In Slavic culture, at death the soul turns into a dove. In Visigothic and Romanesque art, it represents souls. In Hinduism, the dove represents the spirit. This bird was sacred to Zeus, to Athena as a symbol of the renewal of life, and to Aphrodite as a symbol of love. To the ancient Egyptians, it signified innocence, and in Islam the dove is the protector of Mohammed In Christianity, the Holy Ghost of the Trinity is often portrayed as a dove. In China it represents longevity and orderliness while in Japan the dove is associated with the war god Hachiman. In Jewish history the dove was sometimes sacrificed for a mother's purification after childbirth. The dove is sometimes an emblem of Israel
In Genesis, following the flood, a rainbow appeared in the sky and God said, "I do set my bow in the cloud and it shall be for a token of a covenant between me and the Earth."
Some Christians thus interpret the rainbow to be a symbol of God's love and his promise never to destroy the earth. In the Islamic tradition, God created people out of earth of seven different colors. For many this symbolizes the idea that the earth belongs to people of all races. Just as the seven colors in a spectrum come together to form one light, everyone must join together to form one human race.
Try looking up www.theresite.org.uk you can then do searches from there. I can see that they are symbols from the flood etc... but I can't see any connection from them to Buddhism and I'm an RE teacher! To be honest, I should imagine It won't be any more complex than finding out how they relate back to the Flood stories.