Well, first I had to figure out what a Mellotron Choir is, and Google gave me this:
http://tinpan.fortunecity.com/aphex/113/choir.html
And so after listening to it, I figured, well, why not? So I threw together this:
http://www.megaupload.com/?d=ABCISRQW
And well, it sounds kinda cheesy, but, I dunno, the concept might be sound. With better samples it might actually be pretty cool.