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 fun printable poster of the Hindu god of wisdom and success, Ganesha, also known as Lord Ganesh. Ganesha is the destroyer of evils, and is often seen riding a mouse.
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.