Sure a wood plank floor or concrete would have done the job but i wanted a more unique look.
How to make a floor from 2x4 ends.
Use a heavy bed of bostic best adhesive 25 feet per gallon to act as moisture barrier and glue.
Because the cuts are made across the board the end grain is exposed on the face of the tile just.
Mark the center of the area and remove the end grain flooring.
This means just placing the tiles without mortar or permanent adhesives.
Sand them lightly placed them down in whatever pattern you desire and then trowel fill the spaces with glitsa wood flour fill let it dry.
To make a layout with the least cuts on wood tiles you can dry lay the tile.
Cut the 2 x4 or 4 x6 in 3 4 or 1 slices.
If your floors are 15 feet 4 6 m long for example you would position a brace 5 feet 1 5 m from either end.
Lay a row of wood tiles in each direction using tile spacers in between.