I think the best way to make a long tulle skirt wearable, is to choose sneakers instead of high heels. So you become less a princess and more a modern woman, which is not so bad!
Colours breathe life into fashion, and winter colours trend are especially spirited, but well, you know, I like to keep it easy as well and I think the white on white is still a great combination.
And which colours will you choose? It's hard to opt for just one, but to me perhaps all the vanilla and warm browns come to the fore, because they look so elegant and are easy to combine with either black or white.