Unfold the paper very carefully.
The snowflake will not lay flat right away, so I like to tuck them between the pages of a book for a while before displaying them. I have also ironed them (between two pieces of plain paper) to make them extra flat. Watch out though, because paper can get very hot to the touch when ironed (don't use steam!) so be sure to let it cool for a second before handling the paper, and as always excercise caution to avoid fire and burns. Ironing them also seems to make them a tiny bit stiffer, which could be good if you want to hang them rather than tape them to a surface.