The individual labels of the app are capable of displaying color gradients. Colors are based on the Hex System. Use the code without the preceding "#". As following:

EBCB55-B3352F
This will result in a gradient from yellow (left) to orange (right).

FFFFFF-0E2F44
This will result in a gradient from white (left) to patrol blue (right).

To learn more about color gradients and to find the color you're looking for, please check this website.