There have been quite a few RP posts on dressing well, but I can't find anything equivalent for designing a masculine bedroom.

I started renting a room in a new house last week, which is furnished. It comes with a double bed, a couple of bedside tables, a desk, and a wardrobe. All of these items are in neutral colours.

What would other people do to such a bedroom? I suspect some will say that leaving it minimalist is fine, while others will say that you need to add items to show that you're an interesting person with good taste. I'm very interested in getting some opinions.