Use lightweight concrete where you want an easy-to-move concrete object.
Photo of How to make papercrete containers.
Low Rent Renaissance: papercrete recipes
Papercrete Recipe | Posted by F. Michael LaRosa at 5:41 AM sculpture mix (with 2-pound coffee can): ** four cans cellulose insulation ** two cans sand ** one can cement ** water to mix thoroughly but not too wet ** ample (and I do mean ample) readymix joint compound
How to make a fairy house lamp using nothing but Coca Cola plastic bottles, tin foil, paint, hot glue, and paper clay.
sculpture built from hypertufa (aka papercrete) with full instructions on creating an armature, etc. From Garden Web
Would love to make a water feature like this one sometime.
Wattle Fencing: A Cheap DIY Material for Modern Outdoor Spaces | Apartment Therapy