Visor color

Visor colors are available in Halo: Reach and Halo 4.

Halo Reach


In addition to customizing armor, you are allowed to customize the color of your visor from the traditional yellow gold to a variety of colors. There are 5 colors available to choose from. These are purely cosmetic and have no effect on gameplay whatsoever. The colors available are Default, Silver, Blue, Black and Gold.

Halo 4
Visor colors are seen again in Halo 4 but with a wider variety to choose from.Visors can be unlocked by leveling up, completing Commendations and completing Specializations. Like Halo: Reach, these are purely cosmetic and have no effect on gameplay.

Trivia

 * The Silver (in Halo: Reach) and Frost (in Halo 4) visors can be used to replicate the true ODST helmet, and they contain a description implying that it is the color of the ODST's.  The Blue colored option is more accurate according to Halo 3: ODST, however. Also, you have to use the Black visor to replicate the Halo: Reach ODST helmet, meaning you can use three different colored visors to complete the ODST look, depending on what game you want to match.
 * The Gold visor can be used to replicate both the Mark V and Mark VI helmet.
 * It seems that some campaign characters (specifically Jun-A266 and Jorge-052) have their own visor color of reddish-orange. This visor color is not available in the armory.
 * Bungie stated that there originally was going to be a Red visor color that would be unlocked at Inheritor, but it was cut a month before Reach was released.
 * The Black visor's description quotes Henry Ford, saying:  "You can have it in any color you want... as long as it's black."
 * There are many fake YouTube videos showing "secret" visor colors.
 * The player must have at least 435,000 cR and must be a Colonel to own every visor color.
 * If wearing the Default visor color with green armor, the visor color appears golden. This is most noticeable with the Grenadier Helmet. This may be a reference to Halo: Combat Evolved as the Master Chief was completely green, whereas in the later games his armor's color has darkened to sage.