I stored them on a length of knotted rope in an out of the way corner in the old shop.
This worked great. I have over-planned the new shop to where there isn't really a corner that doesn't already have a more important purpose .
My plan was for some sort of as-yet-to-be-determined fixture that would cleat mount or something like that. This general sense of what I would do was never really well formulated though. I figure we have a lot of clever people around here. I have around 4 each of 12", 10", 8", and 6". How do you store yours?