You can loot the Imperial Crafting Motif, even if you haven't got the Imperial edition. And be able to learn it and craft items with it. A friend of mine found itWhen you say Motif I'm guessing that you are on about the Style book's?
If so from my understanding there isn't one, its a benefit of buying the Imperial edition that you can make anything you've crafted be in the imperial style.
That may change later or may become a purchasable item. Though purely being selfish I do hope not.