It's always the blue ones that come up first. Almost all the ones flowering at present are blue or purple. I've lost track of their names, but I can see that there are three distinctly different types.
Crocuses are really useful bulbs. They are small enough to be able to fit into all those little patches of spare space, and they provide a welcome splash of color very early in the year, when there is not much color about.
They are not all blue though...
This orange one is "Orange Monarch", which I bought last Autumn.
I have 10 bulbs growing in a pot.
They are very strikingly coloured, but also rather disappointingly small. With a name like "Orange Monarch" I had expected them to be "regal"!