In my work, color is the tool I use most for illuminating liturgical seasons and occasions. Historically, I have avoided using words on banners because all too often it weakens the effect of the banner: you read the word and you are done. But there are times and special circumstances when words can work to aid. They have to be used carefully, to avoid the read-once-and avoid effeect.
But when the banner and the words work together, the effect can be striking.