The crocuses which I grow in a small trough at the top of the garden are looking lovely this year, particularly the purple ones. I had to protect them from squirrels (which love to dig them up and eat them) by putting a bit of plastic garden trellis over the top of the trough until the corms produced leaves and buds. Some people are confused by the difference between a corm and a bulb. A bulb consists of peelable layers, like an onion (which is a actually a bulb). A corm does not, it's solid. Apparently, although I haven't tried it, if you cut a corm in half, or into sections, each section should produce roots and flowers — so that would be one way to propagate them.
It's easy to appreciate, looking at the above photo of the centre of a crocus that saffron comes from a crocus flowers but not just any crocus. It comes from crocus sativus (below).