For this space I used a simple white down comforter to add loft at the base of the bed, but you could layer a quilt with a throw. (beckiowens.com)
Then, I placed faux fur stools at the base of the bed for some fun interest. (beckiowens.com)
In terms of structure, the base of the bed is 5» thick and made with a combination of memory foam top layer and polyurethane centre and bottom. (thedogclinic.com)