We all get so wrapped up in whatever it is we do (design, marketing, sales, teaching etc etc...) that we forget about the outside world and it's priceless power to inspire.

I personally lose that focus, constantly reading about design, studying design and critiquing design, completely forgetting that nothing original will come out of that. Of course, knowledge is necessary for success, but sometimes it requires a fresh approach. Read a book, travel and engulf yourself in something completely out of your realm. Only then will fresh and original ideas start to flow. You never know where the next great idea will come from, but I can almost guarantee it will not be from in front of the computer.

Try something you have not done before. Walk a different route, choose a different book or travel somewhere new. Report back with your new perspective! :)