I just started poi a week ago, and today I got tired of spinning socks around my head so I went to find something a little more interesting. I found something great at the local dollar store -- a pair of light-up yoyos for one dollar each, with batteries. These things already come with strings, they're designed to be knocked around, and they have four different colored LEDs ... very pretty.
The one annoyance was that I had to knock them every 45 seconds to make them light up. I pried up the circuit boards, attached a few wires, and now I can turn them on and off whenever I want. (In the computer world, this would be known as a Yo-Yo Mod.) I'm not sure how long these things will last, but at a dollar each, who cares?
I put on a little show for my family, and they loved the spinning lights. Plus, they thought the ocasional clonk of a yo-yo against my head was very amusing.
--Jack