Step 1: You will need to cut out a rectangle 27 x 16cm.

Step 2: Create score lines in the places indicated - - - - -

Step 3: Cut a line between fold A and D,  and G and J__________

Step 4:  Now fold the scored pieces as indicated

Mountain Fold  (A, G, K, C and I) the paper is folded behind itself with the crease at the top. 

Valley Fold (B, H, D and J ) the crease is at the bottom and the paper is folded into itself. The paper should form a V. 

Step 5: Decorate as required.