I have medium brown eyes and I've got Scandi Olive and Gray. Both look very natural on my eyes and no one can tell I am using color contacts, even when really close to me.
The Olive is very natural. You only can tell I have Olive/Green/Hazel contacts in natural light. Indoors it can't be noticed. The Gray shows up a little bit more, but it's yet pretty natural. Barely can be noticed indoors and will show up better outdoors.
If you are looking for a natural/subtle look, go for them.