For my last favorite pick (and not my last favorite by any means) -- I'll have to go with Magheralin:
Richardson, 2009
This was a bonus Iris in an order a couple of years ago. I had never heard of it, and thought I probably wouldn't care for it much. Boy -- was I wrong. This is a great big, gorgeous blue bloom that I look forward to seeing every spring.
And that's my 10. I could easily have made it 20!!!