If you want your Christmas tree to look as if it were covered with soft snow, you have several options. The first -- using the real thing -- is a bit impractical; it tends to melt quickly, which makes a mess, and will probably require repeated trips outdoors to refresh it. You can also continue a tradition begun in the 19th century that saw trees moistened with water, then covered with flour. Or you can take advantage of spray snow, or snow-in-a-can, available at hardware stores or drugstores.
When using spray snow, be sure to follow the manufacturer's instructions. Trimming the tree with matching ornaments and crystal icicles adds to the effect. You can also heighten the drama of the spray snow with a few sprinkles of faux snow, which is available in drug or craft stores.