Gussying up Parliament buildings in weird ways seems to be a uniquely European pastime, (though I'd love to know if I'm wrong about that). The most recent seat of power to get a funky art treatment is the Flemish Parliament building in Brussels. Artist Arne Quinze has created The Sequence a 80 meter long and 15 meter high sculpture, in Brussels.
The blurb about it says "The symbolic and physical connection between the neighbors, the Flemish Parliament and the House of Flemish Representatives, reflects a possible connection between all people in Brussels. Cross-culture connections, a connection with Europe, its diversity and entity." Which is nice and all, but mostly I was thinking OOOOOOh, pretty red trees.
The German Parliament has also had an art treatment, Artists Christo and Jeanne-Claude wrapped the Reichstag in fabric for two weeks back in 1995.
And the British Houses of Parliament seem to be constantly used as a screen for projecting things onto, from bare bottoms
to the thunderscats logo