You want a pattern on the top that is significantly different from the pattern on the bottom to make the planes attitude easier to distinguish. A sunburst pattern on the top wing is easy to do, looks really good, and gives very good definition. You only need three pieces on each side of the wing make it stand out. Repeat the sunburst colors on the horizontal stab and elevator for a really sharp look.

On the bottom of the wing, a single wide stripe (6 inches wide or so) on each side makes a good reference.

What color is the background you'll be looking at when landing? If its a dark color, such as green trees, leave the leading edge of the wing white. If its clear sky, a dark stripe on the leading edge will help with contrast, and make it easier to see the plane when making your approach.

A stripe down the side of the fuselage will also make it easier to judge the planes attitude on approach.

Brad