Background of blue, with maybe a tree line of mountain (depending on the area of the country you are in.
Top corner with yellow for the sun.
Streamers from the sun of snowflakes that are in different shades of the rainbow, each streamer a different color, but tone it from brights at the sun to pastels on the ground.
Then have the bottom be in a blender fashion of rainbow colors representing the snow in rainbow colors.
Just my first thought without a pencil and paper to actually draw it out.
Good luck.
When you do make it would love to see pics!