you can find really unusual fridge magnets that are cheap.... from dogs, to footballs to numbers or love hearts. I always throw one in with every gift I give. It's my signature
I bought loads of stuff from the Oxfam website - I got gift for everyone - from my mum to my hard to buy for uncle. I bought Chocolate, tea, tea towels, bowls, fridge magnets. I cleaned them out I think!
http://www.prezziexpress.com/shop/homewares/window-bugz-jewllery-for-your-home
I've put one in with each present this Christmas.. to make each gift a bit unusual
Also perhaps a $10 gift voucher for somewhere a bit weird... like a crystal healer or tarot reader. They won't forget that