Well, last night I just had this idea, so I ran up to my attic with a small desk lamp, a bag of those glass beads that you put in vases to hold flowers still and an old metal sided box, I spread the beads out on the box and the floor around it, turned off all the lights, stirred up some dust and turned the desklamp on. I studied the way the light reacted with the dust, and with the metal, and of course the glass. I then went to bryce with my idea and created this. This image uses one volumetric spotlight with slightly soft shadows on. But, when I rendered it with this I saw that bryce's caustics were... ugly, they didn't work well at all. so, I modified one of the spheres and added an omni light with squared falloff and linked it to the sphere, with the sphere as it's parent, I then moved this omni light away from the sphere along the ground plane untill it rested in the center of the shadow, this created the caustics effect I wanted. I applied a slight slight gel map to go with the bump on the glass and multireplicated, after that it was pretty easy. I just moved the omni further away for spheres that were further right in the scene and less for objects left in the scene. All the omni lights were set to not cast shadows. I then created a square spotlight and applied the copper color with a slight gell bump and placed it alongside the copper box to create those caustics, this again was also set to not cast shadows. You will notice that in the sphere's in the line of sight to this side of the box where the light would reflect I have added a secondary coppre colored omni on the other side of the spheres, but not a shadow. The intensity on this was lessened. The caustics of the torus were done by creating a positive spotlight (non shadow casting) and then a negative spotlight of the same intensity inside it (but smaller) this created the appropriate ring effect when a small gel was applied. (not sure if this is what the caustics of a torus would look like, because I didn't have a torus lying around to test it with. The glow was done in photoshop using a secondary 'lighten' layer. Anyway, hope you enjoy, I'll probably do a gallery image based on this concept, but I didn't think this one looked finished enough.