When anybody asks me something like that, I just tell them it's for a 'Wait n See' Quilt. They either walk off thinking they know what I'm talking about or enquire further, to which I respond that it is too difficult to explain as it is still in the design stage.
Well it is the truth, even if the design is not a twinkle in my brain thought yet, but one day it will be. It is amazing the number of people who just smile and walk off.