I started with the inside niche. I added the pill capsules in the holes and filled them with iridescent snow for, hopefully, a bit of sparkle and pizzazz. I then glued the pieces together and covered them with the acetate. I put the the result under my desk lamp to simulate the future lights and was quite satisfied by the effect.
For the floor, I wanted something translucent to preserve the glow. I cut and curled strips of tracing paper, shoved them in there and bam! instant filling!