I found a place online which was selling expired glow necklaces for $0.25 each. These are the chemical lights which you often see at fireworks shows: they're 22 inches long and have a connector so you can turn it into a glowing choker-type necklace. Or, you can connect several together to form a long chain.

I bought 200, for $50 plus shipping.

There were a couple of duds, but they still worked OK for my purposes.

Last night, while She Who Puts Up With Me was putting Scooter to bed, I activated and connected together enough of them to loop around our bedroom four times, using Scotch tape to attach them to the walls. Then, two strands down the stairs for a sort of runway light effect on the staircase.

Turning off all the lights, the effect was quite impressive, to say the least. They gradually faded through the night, but still had some glow left by morning.

The best part was when Scooter poked his head in the doorway this morning, about 6:30 AM, while it was still dark outside. "Wow, cool," he said, then ran off to play computer games. By the time he came back up, I had already cleaned up.

"Where did the glow stuff go, daddy?"

"What glow stuff? I don't see any glow stuff."

"There was glow stuff here before."

"You must have been dreaming. There's no glow stuff here."

After I had my fun teasing him, I gave him a leftover glow necklace.