Manifestation of humility.
Emulate Rasulullah ﷺ and walk with your gaze lowered, pace with determination and not haste.
The believer's love the colours green, yellow and white. For Allah سُبْحَانَهُ وَتَعَالَى, Rasulullah ﷺ and the Angels (AS) love these colours.
The believer's dye is saffron. The Muslim's dye is henna. The unbeliever's believer's dye is black.