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For me, mostly grey bar while some white. Also I observe that those sites that still show old PR are quite old - those sites that I'm familiar with are more than 2 years old. If you access the site by typing in the URL in address bar, you'll see the PR, but not be so if clicking from the SERP in Google.
All of this gives us excellent insight into the workings of the Google toolbar and the way pr is given.
Google are beginning to use the data from the tool bar to see how popular new fresh listings are. They give a new site a slight boost and if it is popular then it factors that into the pr equation. So pr begins to be valued by 'clicks in' as well as 'links in'
I know... crazy speculation......I'm sorry.