Pipe down. Many of the actual elements are Orman Clarks. Apart from Orman Clark freebies there is nothing that could in anyway be attributed to anyone else or a tutorial. What percentage of design is 100% new? Very little. Design is all about using, expanding, improving and collating existing pieces/practices and the combination of these is design. A movie can have some great special effects and people don't say "What? they didn't make any special effects! The car scene was basically a copy of the italian job, the explosion was from tropic thunder, the helicopter crash was a mix between Die hard 4 and mission impossible.". The design I just posted is a unique combination of design elements which I think have produced an easy to use and intuitive interface.
Do you honestly think that an artist would be able to make nice music if they had never heard any piece of music? NO - they take and expand upon existing pieces to create there own. That's why you get trends in design - everyone isn't magically coming up with the same ideas at once.
yeah I agree, it's very difficult to design something functional (As opposed to purely for aesthetics) without taking inspiration from different sources, because the stuff other good people have used is what works best