This functionality won't be mission-critical to anyone, I'm sure, but a lot of IDEs and upgraded text editors (lookin' at you Notepad++) have the ability to customize the colors of text, the background, and other various tabs/objects that may appear on the screen. I understand that this is more important for code-based systems where the coloring improves readability so much, but I thought it might be a neat feature. I think leaving the tool colors standardized is a good idea though, just the canvas and outerlying windows. It could include the colors for the formula syntax highlighting too?
The icing on the cake would be the ability to save and share your settings or create a repository for them in the public gallery or something.
