roof garden kits?

[hanhol]

ive just been to an open garden and on top of the shed was what seemed to be a layer of turf of which wild flowers and low plants had grown..does anyone know the name of this way of using space and is there a kit i can buy or do i lay a layer of soil then sow seeds on it?

[sunflower71]

i remember reading about these roof gardens, they look amazing (see link)
didnt research it enough to know how to do it though..but have a look though this:
http://www.livingroofs.org/

Some amazing pics:

http://scophy.files.wordpress.com/2007/10/01_h undertwasser.jpg

http://www.bicyclecaravan.org/images/HPIM2652_ hundertwasser.jpg