Different colored Edging may be the result of "Variegation". Variegation is caused by mutations that affect chlorophyll production in certain cells of the plant.
Certain discolorations are due to poor cell formation causing the outer surface layer to have no color, or the few microns of outer skin layer to allow another color to show through. Like their feathered edges, modern variegated or multi-colored tulips grew out of their natural defense against that aptly-named mosaic virus. This adaptation became a genetic part of the flowers, allowing generations of parrot tulips to be grown from the same bulbs.
Referenced from a Wikipedia.com article on "Variegation".
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The photos below are examples of my collection of feathered or splashed petal/sepal cymbidiums. When I have divided them and have extras I have sold divisions of these plants, but because they are NOT MERICLONES, rather genetic mutations, one (1) flowering, 2-3 bulb division is generally only available for division every 3 years. Since they are so rarely available, market prices for these now start at $350, and can go to $800.
