Cool flooring ideas

Puzzle Floor

I like both of these. Though if I were to do the puzzle piece design, I'd want to play up some color differences a bit more
http://www.puzzlefloor.com/classic.php

Checkerboard floor

http://www.ebonyandco.com/ebonybespokechequerboard.html

Etched Concrete

There are some more photos on the website. It's quite striking.

http://www.transparenthouse.com/main/#/en/2/7/104/