The theme for the tilda&co challenge this week is black and white.
Start with half a 12x12 sheet of paper. Trim it to 25cm long. You will then need to score the paper at 6cm, 6.5cm and 7cm from one end. then turn round and score 7cm in from the other end.
Place double sided tape to the edges of the concertina pieces. Now all we have to do is line up the concertina pieces with single crease on the large peice and the folder or wallet is ready for decoration.