I heard many a time if someone was cross eyed, one eye going to the shop and the other coming back with the change lol
My gran would often say if you were lazing about on the couch, you're lying there like a store dug! She also used to say, if we were being a bit lazy, I've seen more life in a tramp's vest. she was hilarious.
My parents always called coal nutty slack. I like as much use as a chocolate teapot. Billy Connolly always made me laugh when he says someone was as much use as a fart in a spacesuit.