We are seeing more and more with Leopard seeds that Apple is growing fond of the color black. Let's assume for a second that Apple uses iTunes 7 as a model for it's new Leopard UI. Which is not to far fetched being that iTunes is relatively new, and is noticeably different from iTunes 6 and Tiger in certain specific aspects of its UI. Most noticeably Aqua appears to be gone in iTunes 7.
Step one, change all Aqua blue scroll bars from blue to the new iTunes color. In this case black would be too strong a color as it would drag the users eyes unnecessarily away from what they are doing to the side of the screen. I suspect Apple chose that particular new gray/blue color so the scroll bars would get out of the way, and eventually begin to look good too.
Next going with that utilitarian look that is present in iTunes 7, in which Apple almost suggests that usefullness is more important than looks, even at the expense of looks (but let's not underestimate how long Apple's UI designers took to choose that color for the scroll bars, and their reasons for picking it, and their reasons for killing most if not all Aqua present too). Actually the more I look at iTunes 7, the more I like it, and I think Apple wanted it that way. Initial woh, then acceptance, then the penny drops as to why they did it, then.. actually now I like it, and I'll tell you why.
This iTunes 7 UI would also apply to all Aqua buttons system wide too, they would all be replaced for more utilitarian push-like buttons, that appear to move instead of just changing color.
Take the source list in iTunes 7. Why did Apple go with the near black color to show what section you have chosen in iTunes. Simple, black stands out, and black is the opposite to white. Black stands out, so the user can see with ease which section they are in, and being the opposite color to white it also highlights the white font title of that section best at the same time. So here's a new UI design idea that's already proven to have worked, and may I suggest it works better then the old ideas. Then why not use it system wide. Yes that's right, i said system wide. That means black spotlight icon and drop down box for spotlight, black apple in menu bar, and black to highlight menu selections instead of blue. In fact black to highlight selections everywhere. Black to highlight what Mail message you have selected, black in Finder, black everywhere. White text shows up more on black than it does on blue. So in that case black, black, black!
Aqua is dead, black cherry is here to stay.