We have a window above the bed, which I accented with three small plants. (The plants help distract from the view of a less-than-ideal neighbor's house.) Above the window, I added blue tulle fabric and blue fairy lights.
In our personal home, we have hung art above the bed before; but like @KenH, we just use heavy-duty wall anchors that have a load capacity higher than the weight of the artwork. (We are not in an earthquake-prone area.)
@konacoconutz, you may notice that I, too, am using the traditional American top sheet and comforter combo rather than a duvet and cover at the moment. However, we wash the comforter after every guest!