Crocus kotschyanus is a fall-blooming perennial bulb, flowering in late September & early October. There are several subspecies from Turkey, the Causasus, Syria & Lebanon. They can be blue, pink, lilac or purple, usually with conspicuous veins. They are said to spread readily from seed, but that wasn't true in my garden. Foliage appears in spring. The are xeric to the point of needing little or no irrigation. They can be ordered online or by catalog from various bulb companies. There are many other species of Crocus that bloom in the fall. But most are not easy to find. If you like Crocus, consider searching for them.
