Diamond Shaped Card
Cut an A4 price of card to measure 14cm x 28cm. (I used a blank square card and trimmed it to 14cm x 28cm with the scored fold at 14cm)
Place the card on your work surface with the short edges across the top and bottom. Using the diagram opposite for reference, mark the left and right hand side of the card 7cm, 14cm and 21cm from the top edge with a pencil.
Score a horizontal line 14cm from the top edge and another 21cm from the top edge.
Score a diagonal line from the left hand 7cm pencil mark to the right hand 21cm score line. Score another from the right hand 7cm pencil mark to the left hand 21cm score line.
Squeeze the folds to hold them in place - the card will naturally stand up on its own.
Apply double sided tape just below the lower diagonal lines then stick to the rectangular base to fix the lower triangle to the base section as shown.