Perhaps my favorite blossoms of Spring: muscari, also known as grape hyacinth.
Their blooms are both delicately simple and hardy through mighty 5A winters. Most gardeners in my area eschew the little ones because their foliage appears messy throughout the Autumn/Winter while not producing a significant impact in the garden. I, however, think a clump of these (they do not appear to know any other way to grow) can be quite stricking. And, as the blooms are so profuse, they make for easy vase clippings.
They are a lovely addition to any garden as they multiply rapidly, are quite inexpensive when purchased in bulk, and fit into any empty areas.