EDIT: New updated version adds the ability to specify 3D variants of the flake, similar to Fugmulch's 3D snowflake ornament (http://www.thingiverse.com/thing:190744). Render the full version in customizer and it will generate multiple STLs, one for each flake and one for a connector that keeps it in place. Flat packable - great for putting inside cards!
One of my fondest memories as a child was making cut paper ornaments at the holidays - folding up paper, making little cuts in the wedge of paper, and then unfolding to see my creation. Now you can do the same online and 3D print them!
Using customizer, you can either draw online or upload a picture from a drawing. Great fun for making ornaments with kids (and showing them the basics of 3D printing!)
More features to come... notably multi-dimension flakes!