First of all, I know that people don't like being told they "should" do something, but the title probably made you read this just to tell me how wrong I am. What I mean is that Pagans could celebrate Christmas without any religious implications. Why? Because Christmas in the U.S. is a secular holiday.
I have always celebrated Yule with my family, but over the last few years of enduring Christians talk about the war on Christmas, I realized that the Christmas tradition is not even theirs to fight for anymore because of the separation of Church and State. This doctrine states that government and religious institutions be kept separate, therefore, our country cannot recognize a religious holiday. The Christmas holiday given to government employees as a paid day off is therefore a secular holiday. Were it a religious holiday in the U.S. then they could not get paid for the holiday. Christians can't have it both ways, they either take a religious holiday off with no pay or they take a secular holiday off with pay.
With this in mind, since government employees (like myself) get the day off, I have no problem setting up a Pagan symbol in my home and lighting it. It doesn't have to do with the solstice or any ancient observance. It has to do with celebrating loved ones and my community. It has to do with the spirit of Christmas is invoked (without ritual) to spread peace and goodwill to all.