I am personally confused by your request. You want to see the final results of something that was shot in front of a green screen, then chroma-keyed out and replaced with something else?

Or are you asking for a few minutes of a video which is nothing more than a camera pointed at a green screen (which makes no sense)?

You can chroma key out any color. Bright green and blues are frequently used because neither color is going to conflict with natural skin tones, and clothing can be chosen to avoid those colors (although, an occasional TV weatherman has been known to get it wrong before!).

Yes - it is an odd request I guess.

What I want is a minute or so of footage of someone, you, for example in front of a green screen.

I've seen the results of video done with a green-screen of course, and just want to "play" with some footage for this.

Since I don't have a green-screen myself, I have no real way of doing this.

Just want a little clip to mess with.

for experimentation purposes, the color of the background does not matter as I mentioned earlier - you can use the chroma key effect on any color you select.

I do not have a green screen, so I cannot do it for you.

If you have a room in your home that has a colored wall, use that. It might not be perfect, but it will work.

Tape yourself doing something, or tape someone else - perhaps interview them, ask them questions. Kids would be fun for this.

Then shoot some footage of something else - perhaps some scenery outside.

Import both clips, and chroma key out the the background in your "interview" clip. Place that clip above the "scenery" clip and your scenery will become the new background for your interview.