The Fractal cases (apart from the Meshify C) are already like that, in fact, there is a whole design trend providing elegant black boxes without gamery LED stuf

The Fractal cases (apart from the Meshify C) are already like that, in fact, there is a whole design trend providing elegant black boxes without gamery LED stuff. Look at the Define C for example, or the Thermaltake Suppressor F51 as one of the clones.