well it's amazing where a bit of experimenting can get you. our lovely boys sent me this gorgeous bouquet to cheer me with my back woes {{it is feeling a little better today, so i just hope that lasts!}} and i tried some icm on it. quite liked one of them and converted it to b&w, then took it into photoshop with a non-icm capture of the flowers on top. then used the exclusion blend mode on that layer, which brought in all those lilacs and purples, when in fact the flowers are all white!
update september 2020 ...
decided that, after five-and-a-half years on this fabulous site, I should say a little more about myself than the two sentences...
i am so glad you had time to play without your back suffering too much. Glad of the boys to cheer you up with the flowers. Tney would know how much fun you were going to have with the flowers and your camera. Hope things continue to improve. Amazing you brought all those flashes of colour out of white flowers - a really enjoyable edit.