The temple has an underneath layer of Chola frescoes on the sanctum walls along the circumambulatory pathway. These frescoes which cover floor to ceiling, were discovered in 1931 by S. K. Govindasami of the Anamalai University. The painters used natural pigments and infused it into the wet limestone layer as it was setting in. The Chola frescoes were largely of Shaivism themes. These were restored in the 2000s. The total Chola fresco area is about , of which about had been uncovered as of 2010 in a method that preserves both paintings, a technique developed by Archaeological Survey of India. The frescoes narrate Hindu mythology. According to Balasubrahmanyam, most frescoes are related to Shiva, but the 11th century Chola frescoes also show Vishnu, Durga and others, as well as scenes of Chola royalty, courtly and common life.