I would like to respectfully disagree with #4 - concrete is very tolerant to heat, however many of the available sealing options are. Though they've come a long way from 15-20 years ago. As well, I would add a water resistant additive to the concrete while mixing as well as glass fiber to minimize any future cracking. In most cases if you don't like the aging after 10+ years you can buff it and put a new color on if you want and reseal.

Hello Yan, wanted to show you an idea of colour scheme for your bathroom. I decided to keep up with your layout idea and I noticed you like grey and wood in interior. In addition, SA contemporary style isn't much about colours but more about textures to keep interior simple and rich. In general, interior is neutral with couple of small colour accents, which can be easily updated or changed in time. There is no drama that sink in front of window! Moreover it gives fantastic advantages to use natural light. You can hang oval mirror at the window frame. In the evening hours, you can use illumination from wall light above window. Flooring is grey brushed concrete tiles with soft matt texture. Wood like porcelain tiles use for walls from the left and right, including curves. That's how you unite broken wall on a left and make it longer and identical. Tiles for walls around window and the opposite side ( including all curves and around door) should be the same - light grey with stone like texture. Grey tone on walls is lighter than on a floor. Here are screen shots (everything is in scale, actual bathroom size): I hope concept is easy to understand, let me know if you have any questions.

Hi. I'm a bit confused, have you bought the vanity and are looking to paint it? Is the rest of the bathroom fitted as you could add brass or copper taps for instance with a matching mirror? Accessories will also warm it. I like a little wooden stool in a bathroom which you can add accessories to i.e. A candle, natural sponge, flannel etc which has some texture. A plant on the window sill if you have one and then nice accessories for the sink and either some coloured towels or I like hammam ones. I've found a couple of pics but they may not post as houzz has issues :( These are using deep rich colours which may bring the cabinet towards you a little. A darker top for the vanity would also work

Thank you Jonathan, I am very keen on this specific feature of corian. I was thinking more about a slippery surface with minimum friction, so dirt and water slides. I think corian has one standard finish but I need to check further.