set global color for layout objects

Now that we have conditional formatting (or perhaps it was possible before), is there a way to specify a color in such a way that many different layout objects throughout the database are automatically assigned that color? So if you gave a particular event database a different color theme each year, you could change this color once and have all of the layout objects that use the color change to that new color, instead of having to update each background, button, etc., individually.

There are lots of ways that might work: you could write a script that changes all of the colors, which you could run once when you create the database, or use calculated fields that would keep the objects continuously in sync. The source color could be designated via RGB/Hex values, assigning a fill color to a layout object or inserting a solid-color gif file to a container field.

I was just wondering if anyone had tried this before and knew the most efficient way to do it, using the latest v9 features.