I love making clear and translucent cards. Papertrey Ink's Vellum is easily sturdy enough to make a card with. In this case I used the large Jellyfish and go with the flow sentiment from Altenew's Painted Jellyfish stamp set. The happy birthday sentiment is from Club Scrap's Gimme A Ring kit. The largest jelly fish layer is stamped with Papertrey Ink's Fresh Snow. I heat set it and waited a while to move on to the next layers which included Sap Green Archival Ink and Wendy Vecchi's Cornflower Blue.
The mat effect is from a piece of folded patterned paper (enhanced with Faded Jeans Distress Oxide).
The folded patterned paper lifts up to reveal the birthday sentiment : D.