We bought a whole bunch of the LED icicle lights last year after Christmas at quite a bargain. The box promises that they are a true white and not that blue-ish harsh light. I think that we will still do the bigger colored lights on the windows and porch posts. I just love that look.
As for the tree, I guess I'll see how I like the outdoor lights this year and if I would want them on my trees. Then I'll look for them again after the season for next year. I do hope that they give us the kind of energy savings that people talk about!