Hi Robert,
Report designer scripting generally falls beyond what we can help with on the forums. That being said, I was able to figure this out with some help from our professional services team and some Google searching.
The foreground color and background color can be altered using the .ForeColor & .BackColor properties. Here is an example of some simple code that will set the background color of xrLabel5 to Aqua.
Dim xrColor
xrColor = xrLabel5
xrColor.BackColor = Color.Aqua
You can find a list of colors / color properties here.
You can find complete documentation for XtraReports here, but I was able to locate how to do this by simply searching Google for “xtrareports script colors”. I also believe that this answers the question you posted here.
-Audisho