Subway 
To dream that you are in the subway implies that you are attaining your objectives without having to use much physical effort. You are discovering your inner spirituality and personality. It may also mean that you are being too impulsive and you should think carefully before making a decision.
Sidewalk
To dream that you are walking on a sidewalk symbolizes your constant development and the path you are traveling through life. Perhaps you are embarking on a bold, new journey. If the sidewalk is cracked, then this represents small and brief obstacles that are attempting to veer you off course. You may have to change your direction and try a new approach.
Colorless
To have a colorless dream indicates that you are harboring emotions of anguish and despair. Perhaps you have been distancing yourself from people close to you.
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