The first version is worked in two rounds, and you can climb between using split rings IF you start with a blind chain. If you forget you are starting with a blind chain, you either end up with the center as a cute little motif or two sets of ends to hide...oops. I love the angled arches formed over the inner rings, and the unusual tip shape. As is my habit, I did remove some picots from the tips.
The second version is worked in one round. I find it interesting that to me these look like completely different snowflakes, because I focus a lot on the center, whereas Joelle considers them two variations because the outer layer is the same.
Both patterns, as well as many other excellent free and for-sale patterns, can be found on her pattern page here.