Closely related to Scilla and Chionodoxa, Puschkinia, or Striped Squill, are excellent for planting in a rock garden, in between shrubs or in pots.  The small attractive starry flowers appear early in the year, and the bulbs increase to form large clumps.  Each flower is about 1/2" across.  They can be forced, naturalize easily and are completely hardy and trouble-free.  Does best in northern climates.  These are small plants, so plant in groups for a more dramatic effect.