I always wanted reticulated iris to serve as an understory, but it blooms so early and wanes before the others come on. The scilla works alright with some of the early daffs and kaufmanniana tulips, although it's not much of an understory at times. I'm wondering if I might try anemone with my later blooming white daffs, because I'm thinking that they start later and hang around a little longer (I'm going to try to pay more attention to that this season)
Here are some more shots of the new (last year) rock garden tulips. They are a bit sparse and I hope they will multiply as well.
'Stressa'