@Kent, I'm amazed at both your method of iris seedling destruction, and at their ability to resist (at least for a while).
I only have the one iris seedling, but I do have many daylily seedlings. I've been cutting and composting most of the seedlings (and have not given away my few "keepers" (which I do not feel are worthy of registration)), on the basis of there already being many better registered daylilies available to anyone who wants daylilies in their garden. (And while there are good registered daylilies, on the other hand there are also some which are not so good, so why add to the problem by setting unregistered seedlings loose in the world?) I had never considered the down-the-road mistaken identity issue, though, when it comes to giving away seedlings. But that is surely as applicable to daylily seedlings as it is to iris seedlings, and another good reason not to give away unnamed seedlings.
As for your iris seedlings... (sorry that I didn't comment earlier, I've been off-and-on doing housecleaning today), I love that last yellow and white one with the blue beard... it is striking.
http://garden.org/pics/2015-05...
Re the yellow one... for some reason, while I love yellow daylilies, I can't work up the same enthusiasm for yellow irises. I invariably gravitate towards the whites, blues, lavenders, and purples, but I have been making an effort lately towards adding some pinks (or pinkish). But
scented irises...hmm... that is maybe another matter...