Our local Audubon has just let us know that they are showing up over here on the east side of the Cascades as well. I have not seen any yet and really hope they don't drive the native mourning doves away.
We had an odd one a couple years ago - a pure white dove in our tree out in front in the middle of winter. After much researching in various bird books and internet, we figured out that it was a dove native to the tropics that had most likely been released at a wedding the previous summer. Poor thing undoubtedly froze to death, which doesn't really seem like a very 'joyous' thing to do. It's probably not a good idea to introduce foreign critters into the local ecosystem anyway, just for a little "Oh Wow" moment, but weddings are so over the top anymore.