Pastel or softer colors look better in flat paint. Chocolate brown or very dark colors, I think look better with a little shine to them. The satin or semi finish will keep them from looking dreary by reflecting light around the room. Painting is the most cost effective way to give your room lots of impact. You may want to select a striking wallpaper pattern in keeping with the color scheme of the rest of the home. Stripes are great for adding volume and height.
Follow your heart! You can be as adventurous with pattern and color as you desire in this room. You can get away with it in the foyer, because remember you are only in this room for brief periods of time. You’ll want the room to have impact and make a statement. Of course, keeping in mind the spaces your entry foyer may be linked to. This after all, is the space where your guest will get a preview of the rooms to come. The goal is to create a continuous flow, room to room, each space complimenting the other.