DS8 does this. He wants to be an author and his creative outlets at this time include writing short stories (he writes a little series that he takes to school and shares with the kids there - he has quite the fan club), crafting his own action figures (he makes up powers/back stories and gives them to his friends), and drawing little comic books. He says it is fun and feels sorry for people who can't/won't do this. "When I "think" it is like I am in the world I am imagining. It is way better than a movie because it is all around me. If my mind was black and closed, I'd be sad. I feel sorry for those people."
He calls it "thinking" and not "creative shocks" but it sounds very similar.
He knows it looks weird so he tries not to do it in public. If he really wants to and it isn't otherwise disruptive, he's just does it and explains what he's doing.
This definitely sounds very similar! My DS used to make action figures, too.. We had a plastic heating thing for him crafting them.
