Looks like I found it, doesn’t it?
But it’s really the effect of low late-day light and a touch of over-exposure in my settings. I’ve changed the overall setting to manual and every once in a while forget to make all the adjustments I need to, or the lighting in the wee monitor tricks me. Many more over- and under-exposed images, but some turn out interestingly, like this one.
It’s water puddled in the ripples on yellowish seaweed. Here’s another, but the puddles here have collected sand and the seaweed is brown.