Merlin's right - adding fabric for designs will have a negative effect on the sail. There are ways to have images and graphics added to new sails. Some people have jibs that are multiple colors, usually a cross cut sail (meaning the sail is made from a series of horizontal panels) that alternates colors in the panels; white and blue looks OK, IMO.
I'm not familiar with your boat, but if it has a classic look, you can order the sail made with dacron that looks like a tanbark sail. This looks very classic and very yachty. The color comes from back when sails were made from cotton. They were sometimes dipped in tanbark (tannins from tree bark), which made them more durable.