As promised, here are some pics from the wacky Kungsträdgården subway stop (I went on the blue line to get out to Kista, so I figured I'd take advantage of the opportunity). This one is from the entrance at street level:
There was a sign there with the artist's statement, and apparently a lot of the architectural details used in the installation here were recovered from buildings from around the Stockholm area.
The highlight of the station is this walkway to the platform, where architectural artifacts are strewn about in the pit below, with (fake) ivy and moss creeping over them.
Oh, and lampposts with neon swirls in them.