To the OP, the pic I posted was under MH lighting. This was under actinics (you can tell because everything in the pic is blue, not just the coral, as opposed to the other pic I posted where you can clearly see the rock doesn't look blue), and I didn't post it because the point is to see the color under real lighting, not blue lighting.
View attachment 191963
Once most leathers inflate and put their polyps out, they don't show as much of their color as they do when they're more deflated (just like the slightly greenish leathers I have that don't look green when inflated, and the pink cabbage leather I have that doesn't look as pink when it's fully expanded). This is the blue one more fully inflated.
View attachment 191964
If you look around on the internet, you can see a few others that are just like mine, so while not common, they do exist. I can't speak on the toadstools, never had one myself of any color.