Those are all nice plants, Sy but they are fall-planted bulbs that will bloom in the spring. The windflowers and snow crocus will bloom fairly early but they are fleeting - a week or two at most then they're done for the year. The others will be lovely, but bloom later. The real beauty of bulbs is that they keep coming back year after year.
My vote for something that will start now and keep blooming unless the weather really freezes are winter pansies. You just need to keep the spent flowers picked off to keep them going and they will give lots of bright color for months. If you do get a forecast for below freezing temperatures, just go out and cover the plants with an old sheet, piece of burlap or even some cardboard just for the nights. (remove in daytime so the plants get light) It will trap warmth from the soil around the plants and keep them from freezing so they will keep on blooming for you well into the springtime.
