Tetris Stackable LED Desk Lamp
• $39.99
• Think Geek

The only thing that would make this seven-piece interlocking LED bulb illuminated table light better would be if it had the feature for playing "Korobeiniki" a.k.a. "Tetris song" when arranged into a specific shape. Still, I'd suspect even younger kids who aren't acquainted with the addictive puzzle classic would find this a fun addition on their desk or bedside. Video below...