Still, even when you have a whole slew of ideas, you can charge along through the outline to the point where you know something has to happen here -- you haven't even gotten your hero and heroine to meet, which means their trek across the plains, chased by merciless bomb-throwing anarchists, has a slight problem getting started.
So you thrash around with the world-building and the plot elements and the characters and you think -- I know, they will X!
And you like it.
But do you like it just because it lets you go on? Or because it's really inspired? Lots of writing books warn --sagely -- about the bright idea you just had because it's so easy to reach for a cliche, which slides graciously into the place as familiar and well-fitting.
I hate wrestling with these questions. It's hard to evaluate your own creativity in the throes of it.