My medium of choice was Spray Snow (also called Santa Snow or Spray Frost).  It is the stuff that comes in a can and you can spray it around your windows to make them look snowy or frosty.

I decided to kick it up a notch and use it with stencils.

 Where did I get this idea? 

Well, my dining room has a GIANT mirror on the far end of it (since we live in a townhouse, that is shared wall and the mirror gives the illusion of a window.)   The problem is that it also can feel really “tunnel” like it reflects the long rectangular dining room table.  Not like a real window.

And since we never get snow here is California, I thought it would be the perfect opportunity to add some of my own!  Like a little snow shower outside of the window. They look perfect on that mirror!
To get this effect I chose the three-piece snowflake stencil set (in Medium) from Cutting Edge Stencils which was PERFECT for this! If your window or mirror is smaller they make a smaller set that would work better.

The only other thing you need is some Spray Snow (or “Santa Snow”).  Don’t use paint unless you don’t want it to come off easily!

The process is pretty easy.   Tape up the stencil, spray the snow from 6-12 inches away and remove stencil.  You may want to put down newspaper below where you are spraying since some will fall to the floor. 
The beauty of the stencil set is that you get three different sized snowflakes, and you can use the stencils over and over.  You could even layer them! The spray snow is really cool too since it actually looks frosty, with a slight texture.
And if you spray it on a mirror, it looks like the flakes are actually FLOATING.  I love the illusion.

Of course, if you didn’t have a big mirror, you could also spray them on windows or glass doors.  They are semi-transparent and would really pretty in the sunlight. And once the season is over, they wipe right off with a little glass cleaner.

And the best part.. I get to enjoy my snow at a balmy 70 degrees!