You'll need paint swatches, double-stick tape, an X-acto knife, ruler, and cutting mat.
For the box bottom, cut a 1/2" strip off each of the two rounded ends of the swatch. You should be left with a 5" x 5" square. At a point slightly more than 1 1/2" from one edge—about 1 17/32" if you want to be picky, but I just eyeballed it—score a line with your knife. Repeat on the remaining three sides. These scoring lines are shown as dashed lines above. Then cut out the gray shaded sections. This is what the box bottom should look like:
The box lid is constructed the same way. Trim a swatch down to a 3" x 3" square. At a point slightly less than 1/2" from one edge, score a line with your knife. Repeat on the remaining three sides and cut out the gray shaded sections.
Fold each sheet on the scored lines, bending flaps inward and securing them with double-stick tape.
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