Source: Martha Stewart Living, July 2005
Ask your lumberyard to cut a 4-by-4 into a pair of 3 1/2-inch cubes and a pair of 2 1/2-inch cubes. Smooth edges and corners of cubes with sandpaper or a file (so they won't snag rope). Paint cubes same shade as rope, and let dry.
Each large cube needs 40 feet of 3/8-inch-thick twisted nylon rope or 35 feet of 1/2-inch-thick rope. Each small cube needs 35 feet of 1/4- inch-thick rope or 30 feet of 3/8-inch-thick rope.
Permanent craft glue
Wooden block cube
Using masking tape, secure rope to side of cube. Wrap as shown. (As you work, tape down loops to hold them temporarily in place.) Continue until front and back of block are fully covered.
Tape at corner. Give cube a quarter turn; wrap in opposite direction to cover sides. (Remove tape from step 1 as loops stay in place.)
Wrap remaining sides by threading through the open loops. (Remove tape from step 2.)
Pull each loop from first round until rope is flush with cube. Trim ends and secure to cube with permanent craft glue.