DIY Vintage Milk Crate Turned into Unique Ottoman Tutorial -- could use the plain wooden crates found at a craft store, plus thick or heavyweight fabric, foam, plywood. Could also add hinges to make the top open for storage inside!
Papercrete: Proportions are 2 parts Portland Cement, 2 parts (dry volume) finely shredded paper loosely packed, & parts sand or perlite. Papercrete has a fairly smooth consistency & paper fibers make it easy to shape. When ready t