-I had a small acrylic box just hot-glued together from some other abandoned project. It's not perfectly square, but good enough.
-I tried wiring a USB light at first, but then I came to my senses and bought one. The color was too cool, so I wrapped it in some orange PVC sheeting I had around. I permanently hot-glued it into a plastic panel on the back to keep it in place.
-The paper portion actually comes in three parts. Beneath the lamp texture is a frame shape made of card stock and painted black to block the light. There were some ragged gaps along the edges after everything was glued on, so my wife suggested adding folded strips of black construction paper along the edges.
I hope he likes it.