I have a bungalow with all the rooms in the front facing North. Have an L shaped hall. I recently painted my hall in Dulux Warm Cream. It definitely lightens the hall and gives it depth. If you have dark paintwork on your doors, you should consider painting them white. It really brightens your space. I have one north facing room painted in Colortrend Pashmina Wool. It's lovely in that room but was far too pale in the hall when I tried it. I have Colortrend Butternut Squash in another North facing room which I wouldn't consider for the hall either. When I was first painting my house, I went to a very good paint shop where the owner gave invaluable advice when I described my room layouts and was spot on with each colour he choose for me (all Colortrend paints). Use plenty of tester pots and test in a few different areas. Be sure to paint a large enough section so you can determine what it will look like. Your floor covering will also play a vital role in what way the colour will turn out. Best of luck.