How to make a blinking PVC Christmas tree

Since Christmas is coming soon, I'm demonstrating in this video how to make a battery powered, PVC Christmas tree with blinking ping pong baubles. I used low density PVC foam, but foam board should work too.
Project page - you can download Christmas tree template here:
ElectronFun.com/project_3.php
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Video, edit, voice by Chris Lorkowski
The actress wearing a Santa hat - Tina
Music:
"Jingle Bells" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/b...

[@nyosgomboc2392]

Thumbs up for your dog. Cute!

[@ElectronFunCom]

+Chris “Twilight Snarkle” Bihary I know she's cute :) Thanks a lot for your comment!

[@thepower123]

awsome

[@ElectronFunCom]

Thanks a lot :)

[@BernhardHofmann]

Excuse my ignorance, but what makes the LEDs flash? I'd imagine they would simply all light up. - confused noob.

[@ElectronFunCom]

+Bernhard Hofmann Hi, asking questions should never be considered as ignorance :) I don't remember if there is any piece of information in the video about the LEDs - they are simply made as RGB, blinking LEDs. I bought them on eBay as RGB diodes, but I didn't know they would blink. They turned out to be perfect for this project, because I didn't have to use a microcontroller to make them blink.