The following flowers volunteer in my garden in the fall.
Johnny jump ups
oriental poppies
shirley poppies
somniferum poppies
larkspurs
forget me nots
foxglove
Nigella
Most of these are prolific and need to be weeded out. I do have some white Shirley poppies that I am going to sow as it snows. I have had good success in sowing them on top of the snow.