I definately celebrate holidays now.
This was one of the fundemental things that are wrong about WTBTS. Where something originate has no bearing on how it is used or incorporated by an individual. Guilt by association is not an automatic thing, in fact it's a very slippery slope.
If you really got into researching where everything came from, you probably wouldn't be able to use anything. Do you have any idea how much stuff we use today because it was originally designed for military use? And I'm not talking about just guns..
God judges us by our actions and what's in our heart. I celebrate Christmas to appreciate what Jesus did for me, to appreciate the family he gave me, and to give of myself freely as he did. These are good things. I'm not celebrating some dumb ass pope, or some retarded pagan dudes ideas, I could care less about them.
Everything you do comes down to the reasons why you do it, if your reasons are good, then it is good. As others on this board say, the world is not black and white, it's in technicolor. Going to church or the hall is not by default a good thing, it's only good if your reasons for doing it are good. If I went to the hall merely to pick up chicks, I'm not doing a good thing. If i celebrated christmas merely to get that kick butt present, that's not good, that's greed. All about reasons.