-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.
--On top of the now-opaque cardstock went some plain ol' printer paper with the texture printed out.
--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. EDIT: He did!