One of the sites I check regularly for cool design stuff is Dornob.
Yesterday I saw this post and fell in love a little bit ;)
Juliana Santacruz Herrera has started a street art project in Paris, filling in potholes and cracks in the pavements with brightly coloured yarn *grins*
For more images, click on the link - it looks so cool. How much do I want to go to Paris to look for it right now?!