Late fall is the ideal time to plant spring flowering bulbs such as Tulips and Daffodils as well as Crocus and Snowdrops.
To get you started here are some scanned images from an old US Department of Agriculture Leaflet I have in my files. This was published in 1966 but the information is still useful. Even many of the varieties listed can still be purchased.
I hope this little pamphlet will inspire you to plant some bulbs this fall.
Bob