Mirrors reflect how we percieve ourselves. Colors can indicate states of emotion. The colors that are reflected from mirrors can tell how one feels about themself. However its important that you do not think blue and just associate it with sadness, depression, - feeling blue. The meaning of the color reflected is found in the context of the rest of the dream. If this was an important part of the dream it would have been the main focus. Recall the rest of the dream if you can, even in just part, and try to find out if your reflection was the main focus of the dream or if other aspects were also important. Especially look for positive vs. negative aspects - pleasant, vs unpleasant - these would help tell you the degree of emotion you feel about the reflection and also help you understand emotion(s) the dream is showing you.
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