So I can't seem to find the the method to change the color of the art board's background color.
This is what i have currently just missing the method to set the color.
var doc = context.document;
var artboard = MSArtboardGroup.new()
var artboardFrame = artboard.frame()
artboardFrame.setX(x)
artboardFrame.setY(y)
artboardFrame.setWidth(w)
artboardFrame.setHeight(h)
artboard.hasBackgroundColor = true;
doc.currentPage().addLayers([artboard])
This link to the sketch reference may help (didn't help me) http://developer.sketchapp.com/reference/class/