Mine are getting one half each of a walkie talkie set each this year.
My dd is getting a bicycle bell in hers, special plasters and lots of hair accessories, and ds is getting a rosette to pin on as he always looks wistful when someone is given one and talks about them a lot! He is also getting a plain white t shirt and some fabric pens to decorate it as that is something else he has talked about, has seen somewhere, and a bookmark.
Match attax and top trumps
Some sort of stationery item.
Dd is obsessed with crisps so I'm going to get a big grab bag to put in there.
A kazoo (always something musical - previous years have been harmonica, jingle bells and er, whoopee cushion)
Always cereal, satsuma, chock coins, big tube of sweets, hot wheel and character socks, novelty flannel or toothbrush.
Matey turns up on Christmas Eve 
I love the crown idea too 