Here's a back view of the blood pool. You can see more skulls- two are plastic novelty rings, the other is part of a Spawn Total Chaos action figure. The bony ribbing on the right is actually flexible tubing (for sheathing wiring), cut in half lengthwise and added on. I usually paint bones with a white base coat, a hasty brown wash, and then a white drybrush for a sharp finish. The chain ladders are made of heavy duty jewelry chain, with short sections of toothpick shoved through each link and painted up with metallic enamels.