Decorating With Slate Tile . Black honed slate tile floor and decor. Choose a gray hue that is one or two shades lighter than the predominant gray color in the tiles to create a decor with a. Best 15+ Slate Floor Tile Kitchen Ideas DIY Design & Decor from showyourvote.org Slate gray ii ceramic tile floor and decor. In a bucket, mix a solution of bleach and water at a ratio of 1 c (0.24 l) of bleach per 1 us gal (3.8 l) of water. For higher quality hard slate you will pay about $20 to $30 per square foot.