I am in the process of planning mine. I just bought a long arm and am converting my ex's office into a new sewing/quilting room for me.
My old room had pale yellow walls, almost a buttery cream colour. I will use that colour again. I will get an electrician in to put in more outlets and lighting. I do not like florescent lights (migraine trigger), so I will go with track lighting, so I can swivel the light to where I need it.
I will use vinyl plank flooring. I have not decided what colour yet, I will decide after I have painted the walls. I also want to see if I can put something under it as the floor is concrete. I will have anti fatigue mats at my long arm. I will continue to use my old sewing room (it is almost next door) for storage and ironing. The family room will become the new office.
Although the room is in the basement I have a wide but short window, that looks out into my front yard. I will put up net curtains, so I still get some light. I had made exh curtains that have cigars and cigar boxes all over them. I want something light and airy.
If wishes were fishes, I would take out the wall between the two rooms and have a huge open space, but the wall is load bearing and although possible to remove the engineering cost would be too much. The also are electrical wires running through the wall that would need to be rerouted.