Measure and cut 4 side panels: Go ahead and cut out 4 rectangular pieces of cardboard making sure the length matches the length of the bottom piece. These will later have to be attached together so they need to have matching dimensions.
Tape the bottom and side panels together: Place one rectangular cardboard panel along each side of the square bottom piece you’ve made earlier. Then one by one go ahead and tape these together on the side that isn’t covered with decorative paper.
Cover the side panels with decorative paper: First of all, prepare four pieces of decorative paper just wide enough to match the side panels of the box. Then glue them onto these cardboard panels to cover them completely on both sides.
Lift up the side panels and secure the corners with decorative tape: Lift up the side panels to form a 90 degree angle when they meet and secure them with tape. Now your box should start to take shape.