We want this. Cardscape is a desktop mail and card organizer designed by architect Eduardo Rosa and illustrator Aude Van Ryn. But it's not just practical. It's art (there's a limited edition of 150), it's architectural (it's a flat-pack, DIY kit), and it's fun (it comes with four cards that can be used to create abstract urban environments, and eight metal clips in shapes like an umbrella, a dog, a street lamp, a skateboarder). Oh, and the base is made of a car air filter.
£30 from London's Oliveira Rosa Architectural Design. You can order one here. (Thanks, Treehugger!)