something easier and cheaper might be some greens like turnips that you could plant as seeds and they would grow earlier - in the winter. they would be green while the grass or other around them would be brown in teh winter.
If you use bulbs i would use several different types suited for your zone in the event that some of them do better than others based on weather conditions.
If you use bulbs i would use several different types suited for your zone in the event that some of them do better than others based on weather conditions.