Perhaps you don't like raised designs on a swirl blanket? Therefore, here is one where the swirls are actually lines of voids.
The full article about this pattern is here:
More info about project photographed on Ravelry.
Spin The Wheel Blanket Free Crochet Pattern
While the base of this swirl blanket is rectilinear, this pattern also uses a swirled weal to give it a sense of motion. I like the gentle contrast.
Rainbow Swirl Free Crochet Pattern
Finally, this swirl blanket uses a square spiral to denote the moving center. In fact, it uses two, because the colorful one is offset by a white one.
Raised Bunchberry Square
A raised center makes this floral granny square stand out. This is one of 36 free crochet patterns for 6 (15 cm) squares by 30 different designers included in the Mystery Lapghan Crochet-A-Long. This
Crochet Velvet Post Lines Throw
Cozy AND textured, this velvet blanket is the absolute king of bulkiness and drape. Truly, it's the perfect companion for a lovely evening, a hot tea and your favorite book.