Purchase a string of small white lights. These are often known as "twinkle lights" and can be found at any hardware or lighting store. Select a string that has at least ten bulbs.
Flip the canvas over and place it on a flat surface such as a table.
Position the light string along the inner edge of the canvas. Start at the top left corner and pull the string around until it covers all edges.
Tape the wiring of the light string to the back of the canvas with small pieces of electrical tape.
Hang the canvas as desired, and plug the light string into an outlet or extension cord. The twinkle lights will give the piece an airy, art gallery-like feel.