Wood-look tiles - What do you think of these tiles?

Thank you, that's roughly how I imagine the result as well, so I will probably choose a brown joint.

I had not even thought about the tiler possibly using the wrong grout color. I still have to discuss that with him.

Yes, better do that, as a layperson you unfortunately have no idea about it yourself

I will definitely do that. We talked about the joint width but not about the color. Not with any of our tiles, apparently we were asleep there.

I hadn't even thought that the tiler could use the wrong grout color
I still need to discuss that with him.

If you are building with GU, the tiler primarily uses the color described in the construction service description.
If you don't think along yourself or have a thinking/advising craftsman, it will just be standard gray.
Our tiler was quite a chatterbox, but that was good for the consultation.
The same applies to finishing edges, etc.

Here are a few pictures of our wood-look tiles.

The first picture (sample at the tile center) was the first tile we had considered. However, we discarded it again because, upon further reflection, they were too busy for us – see page 3 of this thread for the reason. We found the strong grain to be disturbing after all.

The other picture shows our living room tiles with the corresponding grout.