Here is a view from the top, so you can see the concertina effect:-
They flatten out, but still need a box rather than an envelope to accommodate them, so I made a custom box to match:-
This is what it looks like on opening:-
& here they both are together:-
& because these cards are so much fun to make, I made a purple one too:-
Card Components
All Stampin' Up!
Cardstock & Ink Colours
BLUE - Lost Lagoon, Baja Breeze, Soft Sky, Pear Pizzazz & Very Vanilla
PURPLE - Elegant Eggplant, Perfect Plum, Pale Plum, Certainly Celery & Whisper White