Holiday Surprise: A Quiz

Warren walked into my bedroom Wednesday morning.

"Look! It's bright green!" He held the object in his hand out for me to see.

Now...guess what the object was?

It's Green: Some Hints

1. It is not and has never been alive.
2. It was sort of a forest or kelly green.
3. It did not involve anything coming from a facial orifice (it's not phlegm).
4. It has never been edible.
5. My dog is still white.