I really like the new Office 2007 themes introduced in Beta 1 Technical Refresh compared to previous versions using the temporary gray skin.
It took me awhile to find where to change the theme in Outlook - it's under Editor Options.
The theme looks a little different in Outlook, though it's possible (probable) that this may change in the future. My only complaint is that the the title bar is a littel paler than the toolbars (since it doesn't have the left icon giving it weight there). It's almost as if the application doesn't have focus - I think these two colors should be reversed, giving the toolbar more weight.
I was initially excited about the new black theme. It looks very nice here, although it does feel a little harsh in use.
It also appears that not all of the application has been skinned - see the status bar with black over dark gray text.
OneNote, the only other Office program which I really spend significant time in, doesn't yet have themes. It's not getting the ribbon so not clear whether it will eventually get themes as well.
It would be great if Microsoft opened this up to complete user skinning, but we should at least be able to create our own color schemes.
Oh, and the new calendar is absolutely gorgeous.
