I've blown it up and seen faces and critters in there, but I'm sure that's just "faces in the clouds." Kinda thought maybe an x-ray, but there is too much other color in there.
Need a clue...how much PP (if any) did you do??
To me it almost looks like a close up of a painting. The lines look like they could be brush strokes. The blue looks like it comes from a filter, but on the bottom of the pic there's a slight tinge of yellow/orange coming through, so I think I'm wrong on the filter.
I've thought it down to 3 choices..
1. Some sort of stone, marble maybe?
2. Abalone, My guitar has some of that in the frets and it looks very similar
3. One of those liquid stress relief ball things.
absolute last guess..... then you better tell us before we have a brain aneurysm!
Time exposure of waves/breakers