Two color caps in package

Two color caps why become more and more popular in nowadays package ? 

two color caps design is much nicer than single color, it can be more recognizable among others. 
two color caps is not easy to copy. Especially for high value product, to protect patent is very important. The first designer pay a lot to do the design, while put into market, others will follow very fast, if your design is too simple, you can find similar design in market very soon. 
For above two reasons, two color caps become more and more popular, especially for the package of high value products, like cosmetics package, shampoo and gels…