Caeruleum (Achievement #51 = 8 points)

Blue

From every shade to every hue,

it's the most varied color

on the spectrum

There's already a multitude

of tones

at any altitude—

anywhere from the sky to the sea

From sky blue to the fathomless depths

cerulean, cobalt, teal and azure

From subtle changes to eye-catching variations

There are even blues named after nations

Persian blue and Egyptian blue

Travel over lands and oceans for

Prussian blue and Bleu de France

It's a symbol of royalty (royal blue)

and throughout history representing

ancient civilizations (Maya blue)

From daytime to nighttime

the sky even reflects various hues

baby blue and Arctic to navy

Or my personal favorite #000033 for the programmers,

nerds and coders

otherwise known as

'Midnight Express'

A color of tranquility

or trust and loyalty

to a sense of coolness and authority

it wins in all categories

Blue