I think a big aspect of creativity is finding new connections between things, applying a technique to a different domain, and combining ideas.
I think you need alternation, between stimulation and boredom. And the stimulation needs to have interesting ideas in it. Though, depending on the type of person you are, you won't find it novel (and therefore not stimulating) unless it does have new and interesting ideas in it.
But to be fair, I find my mind does tend to wander to creative problem solving if it's not occupied. i.e. boredom does help me. I think it might be that working out new ideas is hard work, and it's easier to be distracted.
This is where coffee comes in. It kicks your brain up a notch, such that when you are busy reading blog posts, listening to podcasts, and chatting with your pals, you still have some spare brain cells left to feel bored.
I think you need alternation, between stimulation and boredom. And the stimulation needs to have interesting ideas in it. Though, depending on the type of person you are, you won't find it novel (and therefore not stimulating) unless it does have new and interesting ideas in it.
But to be fair, I find my mind does tend to wander to creative problem solving if it's not occupied. i.e. boredom does help me. I think it might be that working out new ideas is hard work, and it's easier to be distracted.