This is from a conversation on Slashdot about ribbon style toolbars in OO.o:

What would be even better would be to add background-highlights on the toolbars
that OO.o thinks you'd be most interested in depending on your cursor location.
In your example, editing text in a table, the "Text" toolbar would be most
highlighted, the "Table" toolbar slightly less so, the "Page" toolbar less
agian, and the "Picture" toolbar would not be highlighted at all (or perhaps
anti-highlighted/dimmed to indicate it serves no purpose in your current
context). Visually it would be a lot like the "Aging Tabs" extension to Firefox.

That way it makes it easier to find the toolbar buttons you'd be interested in
without them getting lost in all the rest, and at the same time keeping them all
in their original locations so that once you've memorized where a button is you
don't have to hunt for it again when in a different context.