Some of the table top renders which i did to test out various indoor lighting scenarios. Didnt use any lights and tried emitting photos from the different materials plugged into the rectangular cards. This exercise also helped me to learn how materials could even help in lighting as i once believed that lighting could only be done using different lights.
Basically used mental ray with final gather as indirect illumination.
These models are available for download in the download section if you would like to practice.
Will upload a tutorial of its making too.