Tweening a MovieClip with some colour

I’m making a game which is based on a two-dimensional map of a rather small size (less than 32x32), I want to add some colour to each of the positions on this map, depending on that areas properties. All properties range from zero (0) to one (1).
For example, if an area has much of one property then I want to add some green colour to it, showing that it’s a “good area”.

How to do this with ActionScript 3.0?