My stamp club did these when Oval All was in the mini. The Amethyst layer is the part that opens up. I know I got the idea from someone here, but I have no idea who at this point.
Stamps: Oval All
Inks: Stazon Black, Almost Amethyst
Papers: Certainly Celery, Almost Amethyst, Whisper White, TeaParty DSP
Accessories: Aquapainter, Small Oval Punch, Scallop Oval Punch, White Taffeta Ribbon