I think it is closer to Tri-Sigma or dont try at all! anyway I think that is cute!!
I think that banners should reflect your event theme. So if it is bid day use your t-shirt slogan and add to it. Or if it is Greek Week...make a banner for each day of what the theme of the day is going to be! It is a lot of fun to pint them with your sisters and you can make a siserhood out of it![