Mission UI colors are automatically generated.
It’s the best I can do with a single inanimate texture.
These aren’t important enough to obscure your vision. One might even argue that the score itself should also be hidden (but don’t).
If you only have one monitor then the crash report will not not useful.
It comes back if you make any selection. It’s not ideal, but better than never being able to preview how it dissipates (and much better than a UI toggle, so don’t ask 
)
Argh! 
Which sound was it, do you remember?
No clue.
I had another look, and I don’t think it’s unique enough.