I really like this acrylic light fitting. It comes in 3 different sizes: 24cm, 34cm and 44cm diameter. The concept, by Philip Bro Ludvigsen for Le Klint, gives the owner total freedom and flexibility. The inner shades can be added to give texture and/or color to the light fitting.
My favorite inner shade is smoke.
Find it all here for around 129€ for the basic starter kit and inner shades from 13€.