I used a mono-filament clear thread to suspend the vellum snowflake between the mat layer and card base. I originally saw this idea in the Technique Junkies newsletter a few years ago. The snowflake is double-sided and can twirl when the card is open.
Stamps: Snowfall and Snowfall Additions
Cardstock: Aqua Mist, Vellum, and Stampers Select White
Ink: Versamagic Turquoise Gem, Versamark
Accessories: Aqua Mist Satin, Aqua Swarovski crystal, ultrafine iridescent glitter, Sticky Powder
Tools: Marvy Snowflake Punch (the blue one), Spellbinders Tags Trio Die and Plain Circle Die