1. The following directions are for a 4 1/4-by-6-inch card (which fits nicely into a store-bought envelope), but obviously you can adjust the dimensions to any size you like. Using the ruler and pencil, trace a 12 3/4-by-6-inch rectangle onto your card stock or paper and cut it out.

2. Fold the rectangle in thirds, accordion style. From the top third, cut out a window that will fit your artwork, leaving at least a 1/2-inch border around the edges.

3. Slip the artwork behind the window so that it's centered. Now, glue the back of the artwork and the frame around the artwork to the paper behind them. Place the finished card under a book for about an hour to set.

Tips:
If you don't want to part with your child's original artwork or want to use a very large piece of artwork, you can make reduced copies with a color copier.