I am curious why all of these changes are taking place on the live internet-facing server instead of on a test platform somewhere. At least, that's the impression I'm given.
Why not craft up some new themes, make them available as optional themes for us to try out, then vote on a default theme?
The new toothpaste-green on black theme isn't much of a change, but now it's obvious that the top-left logo isn't transparent, since it still remains the previous grey.
EDIT: Also, why is the post talking about this change locked? That seems to discourage discussing these changes.