To create the backing of the box, create a new layer that is a copy of Layer 1 with a yellowish color. Clip the layer and move it's positioning so that the new layer looks like the bottom of a container. Then, create a lightbulb pattern and fill a new layer with lightbulbs. Scale down the layers to make smaller bulbs and then clip to the layer that represents the bottom of the container. Distort the bulb layer as necessary, and mask out some of the bulbs completely as you see fit so that the lights fit the enclosure.