What about bathroom countertops? Yep, we do a lot of these out of concrete. Here's one we did in Dallas, TX. This was actually two projects in the same place. The homeowner liked the first one we installed so much that she called us a few months later to put another one in her daughter's bathroom. She wanted both to be the same color. I always tell my customers that it's impossible to get the exact color; we can get close, but not exactly the same. These came out pretty darn close, as you can see in the pictures.
Though these countertops were built at different times, both were fabricated as precast countertops. We took measurements of the existing bathroom countertops and used these templates to build the molds at our shop. We poured the countertops after mixing a little pigment into the cement mix to move it from a gray to a softer brown color. We let it cure, and before sealing it, we did a light acid staining of the countertop because our customer wanted it to have some personality and the acid staining creates a mottling effect. Usually, concrete countertops have plenty of personality on their own when they are trowelled. The trowelling action, which smoothes the surface of the concrete, creates lighter and darker areas, smoother areas, etc. It creates variations in the appearance of the surface as it's a manual process. This isn't the case with precast countertops because they are normally cast upside down with the top of the countertop face pressed against a very smooth mold. When we open the mold, we flip the countertop around so that it's face up. However, this face, because it hasn't been trowelled, is very smooth and doesn't tend to have very much variation in color or texture.
The acid staining creates some mottling of the countertop but not as much as if it were a trowelled surface. That's the nature of acid staining. It's a translucent process, and the more personality in the concrete it has to work with at the start, the more it will have at the end. We then sealed and trucked them over to the customer's home for installation. In one bathroom, it was a single level countertop, while in the other, it was a two level. Yep, I think you could agree that concrete works very well for bathroom countertops.