Using this web page, you can make your username any color you want, and not just standard red, blue, green, yellow, etc.
You need to get the six digit hex value and paste it into the field where you put the name of the color. Always put a # in front of the number, or else the color won't show, example: I want light green (R 71,G 255,B 10). The hex value for this color is 47FF0A. You put #47FF0A in the color field.