use the mirror efect,, each sphere is a mirror with a green defuse,, i disabled the sky,, and then i created a big sphere that is like a room for the other ones,, that shpere is also a miror with a green defuse, then i made sure that the camera is INSIDE the big sphere,, and since u disbaled the sjy then you have to add radial lights,, and thats it,, look you can see in the wireframe image i posted that there is like a part of the big sphere i was talking about.. try it