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Wedding gifts come in all shapes and sizes, including cash in all colours and currencies.
For those guests that would prefer to give money than buy a gift, arrange a secure wishing well for them to drop your cards and money into. Wedding wishing wells are prettily made in stiff card that you can buy and decorate yourself. For a more robust version that you can fill with water, so coins and a wish can be dropped in, it's a time to hire. You could also consider a traditional red post box for cards and cash gifts to be posted, ready and waiting for you to open after the wedding.