Design/4 colors

From Nasqueron Agora

Cyan, Magenta, Lime, Orange

SNCB — 4 poles in each rail station
#1172B6, #953260, #A6431A, #467F16 (shadow)
#77EFFF, #F569A6, #FC880D, #A3E509 (sunlight)
Zed — http://zed.dereckson.be/tour.html
#4CD7EE, #FF429C, #92EA00, #FFA41F (gradients)

Other hues

Adobe Corporate Responsibility — http://www.adobe.com/be_en/corporate-responsibility.html
#D9C822, #BD4701, #8AE0AF, #00AFAA