Papercrete

Papercrete is basically paper pulp and Portland cement, a combination being used in sustainable building and housing projects.

Here are a few links describing papercrete, the reason I am posting this information is because I believe there is a use for this technique in prop building whether it be light, solid tombstones or some application to make incredibly durable weather resistant props.

Time for some experimentation.

http://en.wikipedia.org/wiki/Papercrete
http://www.livinginpaper.com/
http://www.greenhomebuilding.com/papercrete.htm