I'm in Japan, by the way. These 100 yen ($1) shops are everywhere. Saw these pocket-tripods and 4-LED strips (4.5v) this morning and got myself an idea.
Step 1: Materials
2. Pocket tripod
3. Drill or Multi-tool
4. Super Glue (optional)
Step 2: The hole
Oh, by the way... be careful not to hit the circuit inside.
If you used super glue, let it set for a while.
Then put the batteries.