I only have 5.5 but it looks a lot like Foamy Seawater which is a default as I've added nothing to this version.Have you tried re installing Bryce from scratch? I know you say you can't find the discs with your ocean foam on but it looks a lot like what you've shown and is a default.

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again