Nicole ~ It is tricky to plant them with a theme in mind. (Sometimes irises have a mind of their own!) The reason that I mention this...
Do you want them to all bloom at the same time? Will you be putting rebloomers together? Or do you prefer staggered blooming and have highlights "move about" in the garden...so there is always something of interest? Are they going to be all tall bearded irises, or will you bring in other classes/sizes to lengthen the iris blooming season?
What area do you live in? That can help determine your length of blooming season. Colors...Do you want a purple bed, an orange bed, a pink bed? Will they bloom at different times in those too, to lengthen the season. What about plicatas, bicolors....etc. Where will these fit in? I know I have more questions than answers, but I just trying to give you an assortment of ideas on which to ponder.
