The fact that's it's of my own design is an important point. It's not an ego thing, but a copyright thing.
Whenever you upload a video to the internet, to Youtube or just share it with friends you should always observe copyright. Unless you made it yourself, music, graphics and of course video loops are going to be someone elses copyright. Basically you shouldn't use them without permission (and possibly payment). A hunt around the internet will provide links to royalty free content and that's what I've always used in my videos.
For those of you who want to try your hand at green screen videos, I'm giving away my background video loop. It's 1280x720 resolution, runs for about 40 seconds and it's loopable, which means the begining and the end match perfectly to allow multiple copies to be joined seamlessly.
Here's the link: http://www.gavtrain.com/samples/circle-loop.zip (17mb)
Usual rules apply. The video is copyright Gavin Hoey 2009. You may use it for personal, non-commercial purposes. Do not redistribute without permission. Most importanly have fun using it.