Okay- sorry to hop on your spritesheet, but this is what I guess you can call "Hue Shifting". Instead of just using a darker shade of the same color, you offset the hue [Hue being the color] slightly over to another color close to the original, thats how you can get the effect that I did here. also sorry for taking a while, i forgot how horrid PAM is for... actually making pixel art, wah

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