This floor is stained concrete !

I've never seen anything like this before, and I think it's beautiful.   The guys who did it have posted an album of the process at imgur, and discuss the technique in a Reddit thread.  Some excerpts:

1. If properly cared for, this floor will last forever. It requires a mop on wax every 6 months in the high traffic areas.
2. Total cost for materials only was right around $500. Labor was free!
3. To get the lines, we laid down 1/2" masking tape and sprayed the stain over. When the tape was removed, the natural concrete color was left.
4. I can't remember the name or brand of sealer and acid stain we used, but will try and dig it up.
5. This floor is just like any other tile or ceramic floor. It is hard, but stays cool in the summer. Very easy to clean. When we do mop, it's just with a mild soap and water solution.
6. This is an acid stain. They have many other types of concrete dyes, stains, and pigments available in all sorts of colors. Acid stain will actually react with the concrete and etch itself in. Once everything was stained, we applied the urethane sealer followed by a coat of wax.
7. We only used one color of stain, brown. The dark areas are full strength and the light area are diluted with water 1:1.
8. For anyone wanting to do this, I suggest doing countless hours of research. A simple search on google for 'acid stain concrete' will get you all the information you will ever need. Not all concrete can just be stained. If the concrete is in rough shape the results will not be appealing. Some concrete will even require an overcoat of a thin layer of concrete in in bad shape...
   
   Remember prepping is EVERYTHING. If using existing concrete. Clean, scrub, mop, vacuum, dry- do this 4 times. And when you think it's clean enough, do it one more time. Fix and repair any holes or defects you do not want to show up also. If prepped correctly, staining is easy and takes no time at all. Just google 'acid stain concrete' or words of the sort and there are 100's of forums and websites to help you pick the best materials and tutorials on how to go about this project.