The pom pom keyring or bag charm is, I think, going to be a one-hit wonder for winter 2015/16, so if you’re into the idea, get yours now.
The best are this Whistles one
ME + EM have a very luxe one at £35 – positioned correctly on your bag and held just so it will look from a certain angle like you’ve got a bunny tail. Which is a good thing.
If you’re on a slightly tighter budget, Oliver Bonas have these for £10.
And this wool version for £22 from Mint Velvet is pretty good, too, although it is ever so slightly reminiscent of Animal from the Muppets.