The basic color of Venus is a transparent white. Venus also rules variegated or rainbow-like colors, which are produced by reflecting light through a transparent stone.
The primary Mars color is opaque red, dark or blood red. Most of military color types are related to Mars: aggressive reds and blacks or disciplinary greens and grays.
The primary Mercury color is green. Generally Mercury type doesn't like much color. They often prefer earth tones, browns and grays, which give neutral appearance.