There's only so many ways you can depict a flower on a stamp, and you'll be forgiven for being bored quickly with the subject. But have a look at these.
In 2005, Iceland isued four greetings stamps with flowers on and I think they're very stylish and beautiful.
This one here (below) reminds me slightly of the Canadian flower definitives.
And this one, the humble tulip, is my favourite.
Well done Iceland!