What to do with old blades?

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Bought this today at a pound shop (for...erm... a pound). I think that'll keep me going for years. Also in pic is a "really useful box" from Rymans... cost £1.59... which I'm going to use to store unused blades.

String'em together to make an attractive necklace or bracelet for your nearest and dearest next time you want to throttle her.