Here's a colourful Hanuman poster to print for Diwali. According to legend, Hanuman, the monkey king, helps Rama rescue Sita from the evil Ravana and defeat him in a mighty battle. Hanuman is worshipped as a symbol of strength, perseverance and devotion.
Here's a printable poster of a diya, the old-fashioned oil lamp used to light the way back home for Rama and Sita in the story of Diwali, and traditionally lit during the Hindu Festival of Lights to welcome the goddess Lakshmi into homes.
Here's a pretty printable poster of the Hindu goddess Lakshmi, traditionally encouraged into houses at Diwali, the Hindu Festival of Lights. She is often seen carrying lotus blossoms and showering coins, as she is here.