I found this idea on pinterest recently. The card is an envelope and the envelope is the card...with a belly band. This is it - the Front:
And the Back:
Here it is closed with the belly band off and below the envelope-card open.
Making the envelope is as simple as following the measurements on the EPB.
For a 3x4 inch card, you need a 6x6 inch piece of paper
and make your first score line at 2 5/8", punch a notch out at this measurement, then
TURN the paper to the left.
For your second measurement you will line up the score line with the plastic prong,
Then score and punch.
Stamps: label love, chalkboard, undefined hand carved "camera" stamp.
Paper: Soho Subway, coastal cabana, whisper white.
Silver ribbon, glue dots and dimensionals.
Envelope punch board. Label punch.
Ink: coastal cabana, island indigo.