Check this page out:
http://www.scentednectar.com/tubes/I downloaded their tubes a few years ago, they are very good and would be good to embellish this roof.
I don't use all of them, but have kept them just in case.
Joëlle
Joëlle, I tried really hard to grow some pretty flowers for my rooftop, but *sigh* it still looks just like my lawn at home.
Tubes, filters, and pixel painting ;-)
Gail