Place paint on your plate in three separate areas - enough to cover a canvas each. Add white paint to two of the piles, one more than the other, and stir.
Paint out a test strip and lighten or darken as needed, until you have three different shades you like. Once you have created two additional shades of paint, paint all three canvases and let dry.
Decide on the snowflake layout on each canvas, and add them to the fronts of the canvases using Sparkle Mod Podge. Let dry for 15 - 20 minutes.
Once the canvases are dry, use scissors to trim the extra snowflake off of the edges.
Finally, add a second (and even third!) layer of Sparkle Mod Podge to the tops of your canvases for extra glitter. Let dry completely before displaying.
Notes
Tip: if you want to make this more kid friendly, have children make their own paper snowflakes that they can then attach to the canvas. The whole family can participate!