I have a few clumps of iris around the house, and 99 percent of them are white. They're very attractive! I would like to have some purple ones, too, though. More common, maybe, but I like purple. Some neighbors have the kind that look mostly brown. Not as nice.
Iris (irises?) are always a good bet for the so-so gardener, as they're impossible to kill. The flowers are pretty, of course, and the spiky foliage stays green all summer and is a nice visual contrast to more delicate plants.
The other 1 percent of my irises: One lone peach-colored one in the front yard. I haven't seen this color before, so it was a nice surprise when it bloomed.
If you see someone who has a big clump of iris in a color you like, you can probably talk them out of a few rhizomes. Irises usually need dividing every few years.