Yes, there is an exciting story which is real. It's great that you are interested to know about these idols. The story is so big that it is impossible for me to explain in details here. In short -- They are the Lord of the Universe - Lord Krishna and Radha. You have to read Krishna Book if you want to know about him. There are so many exciting stories related to him and also we have places where he performed these wonderful acts, one of which is Vrindavan dham in India. Thanks