We categorize all our orders by processing/shipping type. They get assigned a category and the corresponding color (blue="FEDEX rush", red="USPS rush", brown="USPS slow", etc).
BUT ... some of our orders also include customization... and those get assigned to a different category: SERVICE HOLD. They are colored black.
We'd love to be able to see BOTH the processing color & the service color where applicable. That way we also know if the customization is supposed to be rushed.
It could be as simple as allowing 2 categories.... OR having some subcategories that allow for 2 color selections side by side.
It would/could also work if the color tabs were larger and you allowed mixed colors. With the current sizes of the color tabs I think splitting them would be harder on the eyes.