Colour effect is using two shades for lipstick. it might sound weird but the way to do it used two shades of the same colour. You wear the dark one all over your lip except for the centre and then you apply the lighter shade in the centre of the lower lip (the fullest part) and smudge it with the darker shade. Max Faxtor have launched Flipstick collection where you have two matching colours together. I'm not sure if it's available in Kuwaiti stores or not yet.