Assuming that money is no object:
I'd have loads and loads of roses, since they're one of my favourite flowers, and they bloom during outdoor-wedding season.
The dinner would be vegetarian- probably different kinds of curry, since that's easy for a caterer to make for a large number of people.
I think that instead of a cake, I'd have one of those elaborate tiered towers of pastries, so guests could choose between different desserts. I'd hate to have the highlight of the meal be something that someone's allergic to, or just can't stand.
I'd rather wear a suit than a dress. I think I'd go for an old-fashioned tailcoat, like you see in BBC dramas.
Instead of having a single colour theme, I think I'd decorate the place in rainbows.