You know...this might be my extra Proteus. It seems to me that I recall that the first year my other Proteus plant bloomed they were this light blue color (and single).
Here's one of Sue's pictures to compare it to.
I'll do some checking in my old image files to see what I can find. Arabella's buds are not the same as the buds on my plant. I'll post today's pictures soon.
Thanks again for your help!