France is the head of the EU council for the ongoing 6 months. To commemorate the occasion, the Eiffel Tower glows blue instead of it's usual gold. That apart, there's a circular arrangement of stars around the centre. Here's what they look like -

I was blown away when I saw the blue one recently. Its soo pleasant on the eye and stands totally apart from the other lights of the street, the other buildings etc., almost all of which are yellow/gold. And the stars on the centre that look drab by day look spectacular at night. Even better is the show of blinking lights every hour at the hour. It goes great with the blue. More of a contrast, than with the gold. Maybe its just that it's different and I am sure other people have other opinions. But personally, I hope they vouch for keeping the blue throughout. After all, it doesn't hurt to add one more reason to the
Le Bleu tag on France's collar.