Create a flap on your card that is attached to it in any fashion you wish.
For this challenge, I used the frame of Nature die cut from the Cuttlebug to make a red door (to ensure zero wastage), scored the side to make the flap. Instead of using the same colored inner frame, I used one cut earlier in green and glued that in place, and mounted a brown foam butterfly over it. The actual red butterfly is seen flapping its wings away. As for the flower, the red centres remain. To complete the door, I used jewels as the door hinges and a jeweled flower as the door knob. The sentiments are simple - HI and BYE.
This card is also suitable for The Outlawz Twisted Thursday Challenge for June 14 (Anything Goes - Animal).