First of if you haven’t got one already, create a uiltily class so features that you use regulary across projects (you could turn this file into a SWC and reference that in you various projects – now that I think about it I explain this as simple tip #3 )

So inside your utility class place the following code

public static function get randomColour() : uint {
	return Math.random() * uint.MAX_VALUE;
}

Then lets just say you require a random colour for anything just call Utility.randomColour, no brackets, no = signs. Because you’ve set the function as a getter using the function name will be enough. This method also means that you don’t need to remember the max/min values for a colour. The uint min and max values are the same as the the min/max values for colours.

e.g.

<mx:Canvas backgroundColor="{Utility.randomColour}"
   width="600"
   height="600">

Utility is the name of the class that holds my utility functions.