As a designer, I find it somewhat perplexing that people here demand that code be directly copied for something like this be wrong. Design is more abstract than code, yes, but it's just as fundamental a part of the resulting product.
Copying design, especially when the original source is so obvious, has damaging effects that are hard to quantify. Poor clones can directly damage the creation of a strong original brand and can preempt future creative product positioning. Because it is not user facing, identically copied code--when the design has been changed--has no such effects. Why do so many people believe that only copying code should be considered wrong when design has the potential to be more damaging? To me, they are both equally wrong.
Great artists steal. Please steal my ideas. Take them, manipulate them, and build them into something that is your own. I wouldn't have publicized my new platform if I didn't expect the ideas to be used. Just please don't copy my implementation or designs. I need those things to be sacred so I can craft experiences that are not diluted by external factors.