Using a purchased lampshade cut a piece of fabric that's 2 inches longer than the circumference of the widest point of the shade (in case your drum shade angles slightly).
Using clothespins, start at the front of the shade and wrap the fabric around the shade.
Once the fabric is smooth around the shade, use a piece of chalk to mark the top and bottom edges. Remove the clothespins and fabric from the shade.
Cut the fabric to the shape of the chalk lines, making sure to add a little extra for the back seam.
Using heavy-duty spray glue, spray the shade generously.
Lay the fabric on the shade, beginning at the center front and working around one side to the back. Repeat for the other side. At the back seam, turn the fabric under about 1/2 inch, finger-press, and use fabric glue to secure the seam.
Complete the shade by making either double cording or bias tape from a contrasting fabric; glue it to the top and bottom edges.
Note: Many shades have a plastic-like backing that melts when you use hot glue on it. If you're using hotmelt adhesive to attach the trim, use only a small amount on the fabric side.