for less than the price of a fancy cup of coffee, you can rescue a child from the boredom of not having their very own microcontroller to program.

http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313&_nkw=atmega32u4&_sacat=0&_from=R40

while you're shopping for all the kiddies on your list, get a spool of addressable LEDs for just 27 cents per light - and cut the spool into pieces whose length corresponds to how much you care about each recipient.

http://www.ebay.com/itm/WS2812B-WS2811-RGB-LED-Strip-5M-150-300-Leds-60LED-M-Individual-Addressable-5V-/231105154168?pt=US_String_Lights_Fairy_Lights&var=&hash=item35cef0cc78

and of course they will need a way to power the thing while they're wearing it, so don't forget a rechargable USB battery pack for only $2.53

http://www.ebay.com/itm/Portable-Mobile-Power-Bank-USB-18650-Battery-Charger-Key-Chain-for-iPhone-MP3-/370952498512?pt=LH_DefaultDomain_2&var=&hash=item565e7ded50

don't forget micro USB cables: (short or long)
http://www.ebay.com/itm/10CM-USB-2-0-A-to-Micro-B-Data-Sync-Charge-Cable-Cord-For-Cellphone-PC-Laptop-TE-/121199903418?pt=LH_DefaultDomain_2&var=&hash=item1c3813c2ba
http://www.ebay.com/itm/Micro-USB-2-0-Male-A-to-Data-Charger-Cable-Android-MID-Amazon-Kindle-fire-4-TE-/121199914955?pt=LH_DefaultDomain_2&var=&hash=item1c3813efcb

and here's the source to get it to do POV with one color:

https://github.com/jerkey/pov_ws2811

maybe someone will make a color POV for it?

http://www.adafruit.com/blog/2013/08/08/coming-soon-minipov-rgb-led/
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