Inflatable Bag Monsters Attack New York

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Joshua Allen Harris makes monstrous sculptures that inflate when the air expelled by subway cars pass under the footpath grates in New York City. The rush of air throws the creations into an animated frenzy and then they collapse to sleep once again as the coach moves on.
Via New York Mag
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Mutate Britain - One Foot In The Grove

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Hidden beneath a London motorway flyover and behind railway lines, in a space reputed as where the first real, professionally produced piece of London graffiti was thrown up, One Foot In The Grove is a temporary open air arts exhibition of all sorts. Street art, installations and giant sculptures curated by The Mutoid Waste Company and The Cordy House Family, dominate the 15,000 square foot space and is running now until 25th October.
More info here
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Mark Jenkins - Street Installation Extraordinaire

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Mark's work consistently amuses and sometimes can even cause concern. A great mix of sometimes cute and sometimes sinister public installations.

Mark's site even offers a tutorial on how to make the tape castings for your self.