Abstract: A sculpting medium is provided comprising a filler of polymeric microspheres and optionally, a fibrous filler, a thixotropic hydrogel binder and water, all blended in a proportion such that the color of the medium is due primarily to the color(s) of the polymeric medium.

Abstract: A syntactic foam product having a desired configuration is set forth. The product comprises a plurality of rigid gas filled bubbles arranged in the desired configuration. The bubbles are defined by respective individual and discrete substantially spherical shells preferably formed of a biodegradable shell material. The shells abut one another. They define open spaces where they are not abutting. Attaching material attaches the abutting shells to one another. The open spaces between the shells are not filled by the attaching material. The attaching material is environmentally degradable. It releases the bubbles under ambient conditions after a selected time interval. The shells are in contact with their surroundings and can relatively rapidly biodegrade.