Two posts above do show a way if you have a good enough graphics program. If your graphics program allows you do do a color seperation output (many do), then you can indeed to two sets, a yellow set and a blue set, with the yellow set on white paper when you print, and the dark blue on just the interior portions of the decal. On closed blue areas, the eye will not be as sensitive to color variation as two blues right ajacent to each other. You'd have to do a reasonable color match to the blue, but it would not be perfect. However, you'd still have to cut the outer edges of the yellow real accurately. They do not need to be perfect, however. A thin line of a slightly off color will not be as noticable as large areas.