Cut out your chosen box parts from the printable patterns. It is easiest to begin by building a larger box, then gradually working down in scale if you want 1:24 size valentine boxes.
For each box you will need a top, a bottom (with a heart shaped center) and two side strips. You can make the largest boxes into wedding or party favor boxes by using the taller side strips.
Cut one edge of the side strips to make the toothed tabs which will hold the sides to the bottom or top of the box.
Begin Assembly
When you have the parts cut out, fold each of the side strips in half, with the colored sides together. Then fold the edge of the strip along a straight edge so that the toothed tabs are facing at a 90 degree angle away from the side strip (towards the uncolored side).
Take one of the side strips and put the fold at the top centre of the heart printed inside the edge of the box bottom. Using the heart shape printed on the bottom as a guide, shape the side strip to form the top lobes of the heart and follow the heart shaped guide to the bottom point. Mark and fold your side strip where it touches the bottom point of the heart. Trim off the tabs between this fold and the short end of the side strip. Repeat the shaping for the other side, but trim the entire side strip off just above the bottom point.
