Vesak Lanterns by Maduranga

Vesak is celebrated as a religious and a cultural festival in Sri Lanka on the full moon of the month of May, for a duration of one week.

Colourful lanterns called Vesak koodu are hung along streets and in front of homes. They signify the light of the Buddha, Dharma and the Sangha.

http://en.wikipedia.org/wiki/Vesak