It’s great that you spent 16 hours making that wood grain and stainless steel look exactly like the real thing — looks nice — but does your app work? Does your app make sense?
In terms of theme design, things are more lenient. I’d say that we can have a design based on real life objects, sceneries, and so on. But the novelty of it should not take priority over how well the design communicates a site’s content.
Especially important since soon enough, we will stop distinguishing between a website and an app.