Red
The color of anger, and hatred. The color of the turrets' lasers. The color of the blood that pours out of my leg and coats my hands. The color of pain, of anguish, of death. The only color left I see, and the last color I will ever see.
Orange
The color of curiosity and perseverance. The color that helped me distinguish reality. The color encapsulating the beautiful girl I wasn't quick enough to save.
Yellow
The color I thought represented happiness, hope, and progress. The now tainted color of the demon's eye who took over the facility. The color of the eye I created. The color that now beckons us all to the afterlife.
Green
The color of adventure. The color of the life I and Aperture Science Labs once had. The color of the plants and the earth I will never see again.
Blue
The color of my deepest sorrows and regrets. The new color of my desire for her future, safe and sound, and free. The color of the cold reality, that I am at fault for everything and everyone's death at the facility. The color of the tears streaming down my face.
Purple
The color of the power I had to make a difference. The color of the Morality core that I knew would render ineffective. The color of the power I transferred to GLaDOS when I didn't shut her down.
Pink
The color of the Party Escort Bot who dragged her back inside to die. The color of my Companion Cube, the only real friend I've ever had, who won't be joining me in my next life. And the color of the love I had for Chell, that can never be.