You just blabber.
And sometimes it actually works out. I honestly believe that the at times simply the act of writing gets the creative juices flowing, allows your brain to actually think about something that, while it may not be entirely worthwhile, at least is more fun than sitting here and writing about nothing. But the writing about nothing is important as well.
I like to think of it as an exercise of matter over matter. Yep. Not mind over matter, because in this case the matter is perfectly able to go through the motions of typing an article. It is that pesky gray matter that doesn't seem to want to cooperate. So I try to subject it to the flesh, force it to think of something, otherwise those crazy fingers just might start typing things the mind will be sorry about later.
Eureka.
And idea comes. The silly exercise of forcing my mind to think about writing pays off, an idea comes. Perhaps it is a lousy idea, but it is more than I had a few minutes ago. I'll take that and mark it up as a success.