Wow, I am going to have to try doing something like that with my iris, you are giving me ideas, now I just need it to be next spring.
We do have a Theme forum here - over on another site we used to do all kinds of theme arrangements, I love having a strange idea to work with. Would love to have you join in there as well.
http://cubits.org/arrangements...
As for the contest or fair, we could do that. Cubits gives us the ability to have photo contests. I just need to set one up and have a prize. I can work on that in the spring, likely not a good time right now as flowers in limited supply. But thanks for the thought as I would love to have one.
I think your theme of "weeds and grasses" is great!!! Now that is a challenge. I would love to have you add that over in the theme thread and see what we come up with!