When you dream about receiving a Christmas card you're about to get some joyful news in your waking life, have just received some or about to be surprised by something or someone.
If you sent a Christmas card in your dream, it's possible you are reaching out to a loved one or reconnecting with an old friend or work colleague in your waking hours. Or maybe you feel you should- think about who the card was intended for- this could be a clue as to who you feel you should be making more time for.
Christmas cards are also symbolic of forgiveness- so perhaps you yearn to let someone know you forgive them or are hoping they will forgive you. It might be the right time to let things go and move on.
Another interpretation is that you may need to show those around you that you care and worry about them if you have been a little closed off lately.
If you were looking at an old Christmas card in your dream, perhaps you are feeling nostalgic and remembering how things used to be. Remembering better times and wishing you had the same again. Is there something you can recreate from this period in your history to make you feel happier now?