If you're one of the lucky folks who have joined the Mozilla Firebird revolution, you may want to check out http://www.phoenity.com/bird/ for some sweet looking icons and splash screens. http://iconpacks.mozdev.org/phoenix/ seems to have the same/similar icons, not sure if one is the old/unofficial site or not.
As I was setting myself up I thought that the default mozilla icon really didn't fit the firebird scheme, so I found some different ones, and shared. The things I do for you 12 people out there, I'm so good.