I took these photos last month behind the Kanagawa Modern Literary Museum in Yokohama.
Rebb, Lu, and Vincent,
I don't remember what kind of sites you've already seen, but I will list some links I just found below. There are many Ikebana schools. My mother practiced Ohara-ryu.
You can choose a school from the following link.
http://www.ikebanahq.org/
http://www.ikebana.org/index.html
There are also many schools of ocha, so I picked the one my mother practiced which is Urasenke. It probably has the largest number of members in the world.
San Francisco
http://www.urasenke.org/
http://www.youtube.com/watch?v=HGr9BGIB6Ys
http://www.facebook.com/pages/San-Francisco-CA/Urasenke-Foundation-San-Francisco/56608491953
Brasil
http://www.urasenke.or.jp/texte/world/e_brazil01/e_brazil01.html
London
http://www.urasenke.orbix.co.uk/weare.html