Step 1: You will need to cut out a rectangle 19 x 28cm.

Step 2: Create score lines in the places indicated.

Step 3: Cut a line between fold B and F.

Step 4: When folding start with A then F. E, D, C, B.

Mountain Fold  (A, F, D and B) the paper is folded behind itself with the crease at the top. 

Valley Fold (E and C ) the crease is at the bottom and the paper is folded into itself. The paper should form a V. 

Step 5: Decorate as required.