For me it was the dwarfs. They come in more colors than the larger irises and the blooms come in all sizes. I have a little less than four hundred of them now so I feel like I can slow down a bit. Last year I became enthralled with luminatas and I want to collect enough to fill a luminata bed..... about a dozen or so not counting dwarf luminatas. I love pinks but true blues just call my name. This last spring for the first time I started looking at the lack of orange irises I grow and noticing the ones that bloomed and really want some more. sigh.....
What I really, really want now, besides my ever wishing for a turquoise TB, is a blue with a pink beard.