Blue and Red shirts were inspired by Paul's writting in Hebrews, “..Let us run with endurance the race that is set before us, looking to Jesus, the founder and perfecter of our faith, who for the JOY that was set before Him endured the cross, despising the shame, and is seated at the right hand of the throne of God.” (Hebrews 12:1-2)
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Orange shirt was inspired by Philippians 4:4,
Paul stating and repeating his statement for us to REJOICE in the Lord always. "Rejoice in the Lord always; again I will say, rejoice."
-Philippians 4:4