As far as I can tell, there is neither established doctrine nor GA agreement on what “spiritual creation” constitutes, nor on the nature of each account in our dual-creation accounts (ie. Genesis 1-2:4, 2:4ff.) I did a good bit of research on the topic in preparing a presentation a few months ago.
In the recent broadcast Stake Conference, Elder Bednar said something that struck me as relevant to the first question above. I had my laptop, and I typed it down word-for-word, or as close as I could get.
“Morning prayer is the spiritual creation of our day.”
Though from context he intended this to be about the importance of beginning the day with prayer, I think it also implies that he holds spiritual creation to be nothing more than the mental planning stage of creation, the blueprints, as it were. (There are interesting visuals suggesting this in the filmed editions of the Endowment. Beyond that, however, the version of creation in the temple combines elements from the dual accounts in the scriptures, and does not have a dual account the way Genesis does.)
I suspect that this is not how most members understand “spiritual creation” but given my experiences and education, I no longer trust my own intuitions about what the average English-speaking member thinks.