Tetris was created back in 1984 over in the Soviet Union. Several years later, it launched on the Nintendo Gameboy, Sinclair Spectrum and a whole bunch of other computers and games consoles.
Moving forward to today, we now have Tetris Lights as pictured below:
The Tetris lights come in sets of 7 lights which contain all the shapes made of 4 squares as found in the original games. They are powered by mains although they are low voltage lights.
Size wise, each square is 4cm cubed making it quite a decent size. At the moment the Tetris Light is available from Firebox in the UK with pre-orders available for those of you in the US. Full details available here. The light costs £29.99.