These Buddhist, Hindu and Jain rock cut temples were built close to each other and the time period of the caves ranges from the fifth to the tenth century A.D.
The frescoes and sculptures are of different gods and goddesses. Some of the images are erotic. Love was celebrated openly in those days, before the influence of Christianity and Islam on Hinduism.
You can see Buddha in the following pictures. There was a strong presence of bats in many of the caves and their droppings were all over the place.
The discolouration of the rock is due to time, but also due to bat and insect droppings.
Related Images: Kailashnath Temple at Ellora - Photos or Ellora Temples sculpted exteriors or Grafitti and defacement of Indian monuments
Or try the posts on Ajanta, which has a separate post on Buddha statues, as well as two posts on the cave paintings and murals at Ajanta.