Cool. I always wondered how to get that specific swirl effect. I usually draw them with the pen tool, but making a smart object + twirl filter is a great way! Cool site btw. Saw a tut on youtube, and clicked on the link.
There are several ways of achieving the factor. I like the smart object thing because I feel like I have better control over the pen tool with Illustrator than Photoshop. But to each their own honestly.