Napoleon III lived here 1848

The London scheme's earliest surviving blue plaque - the second to be erected and the only one to commemorate an individual who was still alive when it was installed. The use of the colour blue was rare and not repeated often - at the time, this was difficult and expensive to manufacture.
Of the (Royal) Society of Arts plaques which survive, almost all are terracotta.

Nick Harrison on Flickr
Spudgun67 on Flickr
Basher Eyre on Geograph
Nick Harrison on Flickr
BluePlaquesGuy on Flickr
BluePlaquesGuy on Flickr
Nick Harrison on Flickr
BluePlaquesGuy on Flickr
BluePlaquesGuy on Flickr
BluePlaquesGuy on Flickr
Nick Harrison on Flickr
Simon Harriyott on Flickr
Nick Harrison on Flickr
BluePlaquesGuy on Flickr
BluePlaquesGuy on Flickr
Nick Harrison on Flickr
Spudgun67 on Wikimedia Commons
See also...