Salvaged from local blown down douglas fir, home-milled, planed to an honest 1" x 6", with the edges relieved.
Glued down. A couple of finish nails hold each board in place until the glue sets up.
Honey brown stain, to be followed by several coats of polyurethane.
The softwood floors will scratch and ding easily, there's no getting around that. However, hardwood doesn't grow here, so one works with what is available.