[update April 7, 2011]

For a more comprehensive list, try http://www.diigo.com/user/Leonieke/my-used-photo

… by others!

Wikipedia > Louis Couperus

Library Thing
: from the original

Schmap Frankfurt > Park & Gardens > Botanical Gardens
: from the original

The things you find on internet!

(though I have to admit, the one on Wikipedia was placed there by myself: totally forgot that!)