@Steve_B:
You can change the login screen color (to gray if you prefer) in the general setup page.
The new logos are here to stay. The old ones are dead. You'll get used to them :)
Well that is great for the login screen :).
So the logos can no longer be changed like before :(.
EDIT: Found it :).
Seriously though, I would seriously change them back if I were you guys. Brand recognization is a major deal for any software or product, you had it and had it well the logo was cool. The new one is blamd and looks like alot of other bland logos. It doesn't stand out or instill in memory just saying. It honestly looks like something those 100 dollar logo services would make.
Makes it 10x worse when the forum still uses the old logo.