Tools: Double-sided tape, scissors, brushes, manuals.
1, draw your favorite pattern first.
2. Cut into rectangles and fold in half.
3. Leave a square in the middle and fold it in half along the side of the square.
4. Fold diagonally. Fold into a triangle.
5. Then cut it into the picture below.
6. Stick double-sided tape behind the square.
7. Stick this on the book and you can paint it.