I've made these pretty little hearts for wedding favours. The design can be in any colour or can just be clear glazed although I think a touch of colour looks good. It can be linked in to match the rest of your colour scheme.
I've made these tags that you can attach - they are easily removable and can say anything you want them to.
They can double up as placenames on the table - I have written names on with either a gold pen or with a permanent marker and which can be wiped off again.
They make pretty decorations for your guests to keep forever as a memento of your day.