No, these little fellers are coloured usually to match the website. Just have a look at the demo page I've put up here.
As I said on that page, there's some very fancy scripting stuff going on behid the scenes. Fortunately, there's a handy f'ree online service that does all the grunt work for you. Just fill in the form with your desired colours and fonts, and it generates all the code for you to copy and paste into your web page.
This was something completely new to me. I've often wondered how it was done!
(From my Marketing Magic "News Update" newsletter)