В разделе Init

def mh(mem):
	def mh(role, data):
		if role==Qt.BackgroundRole:
			if mem.t.r.getValue("local_done"):
				return QVariant(QColor("pink"))
			else:
				return QVariant()
		else:
			return QVariant(data)
	return mh
mem.zzGridWidget.model().modelHook=mh(mem)