Following last year's inspiring Europeana Colouring Book for Grown-ups, we're taking part in #ColorOurCollections again this year. #ColorOurCollections is a week-long colouring fest on social media organized by libraries, archives, and other cultural institutions around the world. Using materials from their collections, these institutions are sharing free coloring content with the hashtag #ColorOurCollections and inviting their followers to color and get creative with their collections. This year, we've turned to Art Nouveau for inspiration with 8 colourless paintings and posters waiting for your creative skills.