I think I'm like Neal too.. OCD pretty much describes the effort I put into trying to get pleasing combinations. I download pictures of every Iris I get.. I play with the pictures on iphoto and then take a screen shot of different combos. Here are a couple I did last night (you do have to click on it to get the whole picture):
I can only do 8 pictures at a time with it though. I also print out sheets of pictures which I cut up and arrange. I write the bloom times and height on the picture, so I can use that information while I'm shifting the pictures around.
I'm with Leslie on putting a white between 'Wabash' and 'Helen Collingwood', Patrick.
A nice clean yellow like 'Happy Days' might look nice with 'Indian Chief'... Or 'Easter Bonnet' and 'the Red Douglas' look nice w/ it too.