llSetColor changes the color of a prim, either on a specific side (face) or the entire prim.
Example: <lsl>llSetColor(<r, g, b>, ALL_SIDES);</lsl> r, g, b: values for red, green, blue ranging from <0.0, 0.0, 0.0> (black) to <1.0, 1.0, 1.0> (white)
Since this is a vector value, be sure to include the <>.
Example color values: <1.0, 1.0, 0.0> = yellow <0.0, 1.0, 1.0> = cyan <0.0, 1.0, 0.0> = green
ALL_SIDES means all sides of the prim will be changed to the new color.
If you use an integer value instead, only that side of the prim will be changed
Example: A cube has 6 sides, with values from 0 to 5. llSetColor(<1.0, 1.0, 1.0>, 0); would change the top side of the cube to white.