The most important thing when decorating a white tree for Christmas is to make sure the colors pop. White is a neutral color, so you can get away with using bright colors like red, green, blue, and gold. I recommend starting with a base of white lights to give the tree a soft glow. Then, add decorations like ornaments, tinsel, and ribbons in contrasting colors. For example, you could use red and gold ornaments with green tinsel and a gold ribbon. Finally, add a topper to the top of the tree, like a star or an angel, to complete the look.