The signs of the zodiac carry different meanings based on their depiction. Frequently they represent aspects of your personality that are not wholly known or acknowledged, and therefore need developing.
For example, dreaming of Virgo may represent your need to reconnect with feminine attributes or clean up your act physically (Virgo is the virgin). Here are some other sample correspondences which may be expanded by reading any good astrology text:
Aquarius: Erratic creative energy; feelings of unrest.
Aries: Quick decisions that may not be wise; courage and zeal for things to which you commit yourself.
Cancer: Paradoxical actions that others find confusing.
Capricorn: A cool, patient temperament that hides deeper passions.
Gemini: A restless, artistic nature; often impedes meeting goals due to getting bored or distracted.
Leo: Strong leadership skills always need to be tempered with wisdom so that you don’t become boastful or pompous.
Libra: The need for balance, especially with the emotions.
Pisces: A strong spiritual nature is starting to develop along with a new sense of responsibility.
Sagittarius: The mark of an overachiever. Make sure your goals are reasonable.
Scorpio: A bold, determined nature that sometimes “stings” to achieve its goals or communicate a vision.
Taurus: Watch your temper and tendency to want “things” to fill up vour life.