Here's how to do it:
1. Choose a picture that can be folded so the focal point looks good on the front. Cut it so the folded card will fit in an envelope. I used 6.5" x 4.75" envelopes that I had on hand.
2. For the liner, get some nice paper that is heavy enough to cover anything that's printed on the back of the card's outer piece. Cut it to exactly the same size as the outer piece.
3. Fold each piece in half, individually.
4. Write your message on the liner. I used a brush marker, which has a long, pointed felt tip. You can make cool writing with these pens by giving a whoosh to each stroke in a letter.
5. Apply double-stick tape to the back of the liner on the fold and on the left and right edges. Try to get the tape all the way out to the edges, from top to bottom. This gives a unified card edge for the recipient to open.
6. Line up the folds on the outer card and liner, and press just the folds together. Then shut the card and smooth it out to stick the edges together.
7. With scissors, trim off any liner that shows on the outside of the card.
