Tekhelet

Click the link for an article about the colour blue that is mentioned as on various parts of the tabernacle and on the fringes of garments: 

Rediscovered, Ancient Color Is Reclaiming Israeli Interest

Blue or "tekhelet" in Strongs Concordance (#8504):

תּכלת

tekêleth

tek-ay'-leth

Probably for H7827; the cerulean mussel, that is, the color (violet) obtained therefrom or stuff dyed therewith: - blue.

Moreover thou shalt make the tabernacle with ten curtains of fine twined linen, and blue, and purple, and scarlet: with cherubims of cunning work shalt thou make them. 

Exodus 26v1

And the LORD spake unto Moses, saying, Speak unto the children of Israel, and bid them that they make them fringes in the borders of their garments throughout their generations, and that they put upon the fringe of the borders a ribband of blue: And it shall be unto you for a fringe, that ye may look upon it, and remember all the commandments of the LORD, and do them; and that ye seek not after your own heart and your own eyes, after which ye use to go a whoring:  That ye may remember, and do all my commandments, and be holy unto your God.   I am the LORD your God, which brought you out of the land of Egypt, to be your God: I am the LORD your God. 

Num 15:37-41