It's not cheap, but totally worth it (if it does what they say it does). Shapes that purify the air (think tobacco, cooking). In the shapes are filters and fans. The shapes itself are made of corrugated cardboard. By NextMade from Italy.
(I had to look up 'corrugated' ... yes, I'm stupid ... and I read the most beautiful sentence ever as an example when using corrugated as a verb: "Micky's brow corrugated in a simian frown".
You can buy it here for $ 190.