Fold a sheet of white paper and trim to create and A6 portrait insert.
Open out and design your border (scallop or other) along the left and right edges in black ink, taking care not go too near the edge of the paper.
Use a scissor to cut around the scallop edges, making sure a narrow border is left around the scallops.
Colour in the scallops with promakers, using shades that will compliment your choosen on the front of the card.
Keeping the insert open, trim a couple of millimetres from the top and bottom edges, open your card and attach a strip of narrow double-sided, tape on the back panel so it is lying up to create your card.