How to Make Travertine Textured Concrete Stone or Tile for Pennies
One final thought when you're casting concrete to represent something like Travertine--- you may want to think about the base color of the concrete
. Gray cement with plain sand and gray aggregate may produce less than desirable results for very light colors. Using white Portland cement or a mix of white and gray Portland cement when using yellow or brown (when you want to get a tan color) concrete colorant may give you something closer to what you're looking for--- a natural looking Travertine stone finish.
How to Make Travertine Textured Concrete Stone or Tile for Pennies