Here are some silhouettes of some typical religious symbols which artist might like to use in their artwork.
This first one is the Om symbol atop a flat.
This is a Kalash. It is usually made of copper and used in Hindu religious rituals.
This is a silhouette of the Trishul of Shiva with a snake wrapped around it.
The two symbols below are of the Swastika, a Hindu sacred symbol.
This is a silhouette of the steeple of a temple.