Did you mean "Saints?"
If so, I just thought of a crazy/funny idea. You could make the sheet cake appear to be a football field but farmlike: meaning maybe make a fenced in area but instead of dirt, it could be grass like the field w/the saints logo and lines/numbers like a real field. Instead of veggies growing, it could be little footballs.
You could make the a farmer w/overalls that has a saints logo on the front and his fav # on the back. He could be holding a hoe or rake and a helmet.
LOL, I HTH or gets some ideas turning for you