"Red" "Sunset color" "Green" "Sky color"? And if you want the effect to always be there, make a dark sun constantly at sunset. Thats my best guess. And remember that you can place a dark sun more than one place to spread the effect to more than one direction.Been trying but still no cigar. I mean I have basic knowledge of creating ages but can't get a grasp on mixing colors especially that bottom part where the orange and green meets.