The flag of the state of Colorado consists of three horizontal stripes of equal width; the top and bottom stripes are blue, and the middle stripe white. On top of these stripes sits a circular red "C", filled with a golden disk. The blue is meant to represent the skies, the gold is said to either stand for the sunshine enjoyed by the state or the gold mined traditionally in the state of Colorado, the white represents the snowcapped mountains and the red represents the ruddy colored earth (from Spanish colorado, meaning "ruddy" as well as "colored").
Variation in use before 31 March 1964, when the size of the emblem was officially specified
Proposals for a New Flag of Colorado
CO Flag Proposal "Graphicology"
CO Flag Proposal "Tibbetts"
Colorado State Flag Remix Proposal No. 1 Designed By: Stephen Richard Barlow 29 AuG 2014
Colorado State Flag Remix Proposal No. 2 Designed By: Stephen Richard Barlow 29 AuG 2014
Colorado State Flag Symplistic Proposal. This state’s flag is iconic so I didn’t change much, just the colors. By Ed Mitchell. 2013.
CO flag proposal "5thEye"
Colorado flag proposal by user Dio the Ludicolo. The blue represents the sky. The white represents the mountain peaks. The red represents the red clay. The eye represents the state motto, "Nil Sine Numine" (Nothing Without Providence). December 2017.
Minor mod to the cut line of the red C so that it coincideds with the horizontal stripe linework. Plus the tincture is fixed by fimbration. Addition of a hollow star. Design by Rotten Ali.
Colorado flag proposed by Ken Morton - Colorado's current state flag is well liked and is widely praised as an example of good flag design. Not by me. The chevrons of this flag represent the Rocky Mountains in winter and summer, the Red Rocks of southern Colorado and the precious metals mined in the state
Correct fimbriation and updated proportions. Posted by Preston Knapp 
Proposal for a flag of Colorado. By Qaz Dec 2019 (details)
Part of a series of fifty state flag designs, all in blue and white. (Posted by Ken Morton)