The label white lie is intended to create a class of lying that is innocuous. Scripture makes no such distinction, so if scripture is the basis for your beliefs, then the appellation "white" needs to be removed. A lie is a lie.
In Nicks example, a child shows an awful scribbling. I have such papers from my grand daughters. Are they wonderful? Of course they are! I love them. In my office, I have a scribbled, faded card that says, "I love you, Daddy" that my daughter gave me when she was 5 or 6. It moves me everytime I think about it.
Most of the time, we can say things that are nurturing. We want to encourage. But directly lying is not only a violation of the moral imperative of the scripture, it also sets a poor example for our children and others.
"Speak the truth in love" is a great scripture to remember. Proverbs suggests that the wise person is one who speaks little. At the least think about what you will say before speaking.
I tend to think of words as tools of our trade. We can practice wordcraft that is not insulting or harmful without needing to resort to lying.