Deviant Artist and Halo fan Scourge07 combined his penchant for art with his passion for Bungie shooters to create a series of wonderful minimalist posters, one for each game in the series.
Well, each core game at least. I do not see a Halo Wars entry, nor do I see one for Spartan Assault, the top-down shooter for Windows Phone and Xbox Live. Genre-bending side stories don't deserve minimalist posters. The core series, however, is quite lovely when stripped to its bare essence.
Check out larger versions of the first three posters below, and then hop over to Scourge07's gallery (via Reddit) for the final three, and to bug him to order prints we can buy.