These observations apply to the Spanish and English Irises as well as the rarer bulbous kinds.
Iris Bakeriana - This is one of the most beautiful of the spring-flowering Irises.
Iris Histrioides - One of the most charming of the spring flowering bulbous Irises.
Rush-leaved Flag (Iris Juncea) - A lovely bulbous Iris, graceful in habit and with bright yellow flowers of a delightful fragrance, whilst it can be grown almost as easily as the English Irises.
If you look at your own irises, you'll notice that several different flecks of color are present there, too.