The Pallava royal insignia was the Simha (Lion) and Nandi (Bull) which was changeable.
But the Color of the flag is saffron or yellow.
Each Pallava king had his own personal banner.
For example, Narasimhavarman II used the lion as his emblem and Nandivarman II preferred the Nandi.
Under the reign of Paramesvaravarman I was Khatvanga (Skull mace) added to the Pallava emblem.