Gather ten to fifteen translucent plastic pill bottles of uniform size, removing all adhesive labels and cleaning the exterior surfaces until smooth and clear. Use a utility knife to carefully cut a small ‘X’ shape directly into the plastic center of each bottle cap, ensuring the opening is sized to fit snugly over a single LED bulb socket. Decorate the outer body of each bottle by gluing colorful tissue paper squares across the surface using decoupaging glue, creating a stained-glass mosaic effect that allows light to pass through. Push individual LED bulbs from a string light strand through the ‘X’ cuts in the caps, screwing or snapping the decorated plastic bottles onto the caps to lock them in place over the lights.