What an interesting thread! I have to say ,I am intrigued by some of the responses, especially OBW and Bargello.
For me, I guess the answer would be I'd never want to make a quilt that I already made, lol. I am willing to try everything once, if I love it great, if not, I am sure I'll learn something from the experience, but either way, chances are very slim that I'd repeat it again, especially that my list of to-dos seems to be growing rapidly...