That's too bad, if Canon won't fix it, I would think it is a waste of time to try and fix it, because most people want that sharp, clear image and I think anything less than that and you won't be happy. So...
You could grow a nice plant in it.
Trophy mount it and put it on the wall as a momento.
Try selling it as is, or as a trophy.
A lot of home contents insurance policies have an amount for loss or broken electrical devices or personal items to a set value, not full replacement, but any little bit helps. Was the lens stored at someone's house that has one of those policies?

Sorry for your loss, Nick.