I'm really liking 2 and 3. Don't forget that essence names need to be two or three words at most. Perhaps just name the second one Mercury Sand?
I'm kinda with Ebs on the Hidden Spark. I like it, but perhaps it needs a different name. Perhaps Love Spark?
I'm still not much on the Frozen Atmosphere one. As mentioned before, there are several sky-fall type essences. Silver Cloud is interesting, but with a cloud essence already out there and with the lightning, it might just step on some toes... ^^"
