This is a finished basement concrete floor that was decoratively scored into 3.5' square diagonal tiles and acid stained "Bronze," a green color with brown highlights from Decosup's Chemtone brand.  This floor turned out to have some of the best coloring we have ever done.  The acid-stained concrete floor was then sealed with a solvent-based acrylic concrete sealer.  If you look close, you can see that the decorative cuts were taken right up to the wall, something that usually is not possible after the framing and walls have been installed.  We did it with our special concrete engraving tools from Engrave-A-Crete.