It might be hard to come up with an idea since "think of something you wouldn't normally think of" sounds like a contradiction. But I am sure you will feel when the idea you have in mind is indeed an original idea for you.
It's essentially about changing your perspective. A lot of things in life are just a matter of perspective :)
I didn't force it, I just couldn't sleep for days end of last year and that changed my perspective on a lot of things. For example that sleep is very important haha