How to add buttons back to the top:
In Terminal type:
To change back, use the same code, but trade YES for NO
How to add color back to the icons:
1. Quit iTunes
2. Download the itunes10color.zip from here.
3. Right-click the iTunes icon and select "show in finder"
4. In Finder, right-click the iTunes icon again and select "Show package details"
5. Open "contents" and locate the "resources" folder.
6. Replace the file "iTunes.rsrc" with the one downloaded
Short version:
Replace /Applications/iTunes.app/Contents/Resources/iTunes.rsrc with the downloaded file
Both are confirmed to work on an Intel Mac running Snow Leopard

In Terminal type:
Code:
defaults write com.apple.iTunes full-window -boolean YES
To change back, use the same code, but trade YES for NO
How to add color back to the icons:

1. Quit iTunes
2. Download the itunes10color.zip from here.
3. Right-click the iTunes icon and select "show in finder"
4. In Finder, right-click the iTunes icon again and select "Show package details"
5. Open "contents" and locate the "resources" folder.
6. Replace the file "iTunes.rsrc" with the one downloaded
Short version:
Replace /Applications/iTunes.app/Contents/Resources/iTunes.rsrc with the downloaded file
Both are confirmed to work on an Intel Mac running Snow Leopard