Profile: somebodies knows HOW CAN I PUT DIFFERENTS COLORS IN MY PROFILE?

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HI guys, how are you? i have a doubt,, somebodies knows how can i put colors or images like wallpaper in my profile? because i saw a lot of profiles of my myloters friends and some of them has colors and images like wallpaper,, if somebody knows,, help me please!!! thanks for helping!!! have a nice day, and merry christmas!!!!