Not sure if anyone else is a fan of Lego but my partner and I both have a passion for lego building and regularly buy each other sets throughout the year and I have been wanting to incorporate this into our day but not take over the whole theme.
I have found on the Lego website a Lego Bride and Lego Groom only £11.99 each and standing at 8cm tall so could either be used as a cake topper or we are going to pop them on our 'welcome table' with our guest book and card box etc. They are fully customisable with hair and skin colour. My fiance is going to make me and I am going to make him and surprise each other the day before.
https://www.lego.com/en-gb/product/wedding-bride-40383
https://www.lego.com/en-gb/product/wedding-groom-40384