I got a new kind of clypeasteridae skeleton. Unlike my previous shots of sand dollars, this sea biscuit as they're also known, is not quite as flat which created interesting depth. I used a macro extension tube on a 50mm at f/20.
I lit it with a yellow LED from the inside and with a blue LED on the outside.
I also got a sea urchin skeleton and lit it the same way. It wasn't as well secured as the sea biscuit and it moved slightly during the exposure. I like how that multiplied the yellow dots. That is what I call a happy accident.