so i should concentrate on flooring color. Wood you do a light grey or a dark gray?

Depth of colour (dark vs. light) depends on several factors. The first is personal preference with the second being the amount light in the space/home. A dark home usually receives lighter flooring...this keeps the area light. A very well lit home can handle a darker floor because the natural light already keeps the space well lit. A dark space with darker flooring is going to get very dark very quickly.

If you are speaking of 'trends', the "dark gray" is already on its way out in Europe and is being replaced with light gray/white. It depends on local trends as well as personal taste as to how you want to go about living in your own home.

What are you trying to achieve? If you are looking for old world charm then a very dark floor = OK. If you are looking for "Beach House" feel then the lighter the floor the better. Your design direction will help dictate what you use.

Asking a whole bunch of people for random colour/floor suggestions is an open question. You may want to help us help you.