Measure the interior dimensions of the box you are lining. You will need to know the height, depth, and width of the cavity--and possibly the inner measurements of the lid, if you intend to line it as well. When you know the measurements, you can purchase the fabrics at a craft or fabric store. The fabric should be woven rather than knitted--the latter will stretch and loose its shape.

Mark the measurements and line up a carpenter's square on a sheet of poster board. The poster board will offer a little stiffening to the fabric inserts/panels for the bottom and sides. If your project requires larger inserts, you might want to consider another stiffening product with more body--foamcore would serve well.

Slide a sharp utility knife along the edge of the metal carpenter's square and cut inserts with true right angles to fit the bottom of the box and each of its four sides.

Test the fit of the pieces you cut by placing them temporarily in the box. As you test the fit, keep in mind the thickness of the fabric you plan to use--if the fit is snug with the stiffening alone, you may need to pare down the size to accommodate the additional bulk of a heavy fabric. If necessary trim the edge slightly, but do not overdo it.

Give the panels a plush or cushioned look by wrapping them first in flannel as underlayment. We use white flannel, because the background of the cotton fabric in the final layer is light-colored. Use scissors to cut the flannel with a 1-inch overhang on all sides of the inserts.

Trim off the corners of the flannel at a 45-degree angle. In a later step, the clipped corners will enable you to fold a "mitered" corner without having to overlap the cloth and add bulk.

Cut individual panels of the cotton print fabric for each insert, allowing an extra inch along each side. Be sure to align the straight edge of the insert along the grain--parallel to the threads of the woven fabric. If you place it at an angle (across the grain), the fabric will stretch because it is cut on the "bias."

Place the print cloth face down on the work surface--cotton print has a definite right and wrong side. Apply the spray adhesive to the front of the flannel-covered poster board and press it face down onto the back of the cotton print fabric.

Place the covered inserts in the box. If the side inserts stand a little high in the box, ensure they are no standing on top of the bottom insert. If so, position them first and then set the bottom in place--its snug fit should hold the other inserts in position. Use double-faced tape or small dabs of craft glue, if necessary, to hold the panels in place on large projects.