Although only in the prototype phase right now, these wooden iPad cases Substrata look gorgeous.
Coming in flavors of dead tree flesh including walnut, zebrano, wenge, mahogany and maple, and shipping with both hinged and sliding lids, the Substrata iPad cases (replete with microsuede lining to prevent scratches) should be available in June for an unknown but probably fairly expensive price.
See the hinged lid prototype after the fold.