Don't worry, I wouldn't suggest pink if you're going for a masculine look!
Most people think of dark colors for a "masculine" room but frankly a dark room is a dreary room. I'm guessing you want a happier space since you say you want to brighten it up.
I would go with warm brown, latte-like colors with darker accents, like navy blue.
I think one of the walls would be a better choice for contrast. Contrast on the end might end up looking like a destination, where as contrast on a long wall would follow throughout the room.
Hope that helps!