She carefully color-coordinated the balloons and ribbons for the party decoration.

color-coordinated 是由 color（颜色）和 coordinate（协调、搭配）组成的复合动词，加上 -ed 表示过去式。color-coordinated 指"在颜色上进行协调搭配"，即"精心搭配颜色使其协调美观"。