Car key dilemma

The problem with having 2 cars of the same make and spec is having 4 identical keys.

So having already had the imperial storm trooper on my old focus key ring, I've invested in some more lego key rings.
Darth vader and his minion are for my far (the mondeo), whilst the red lego people ( wonder woman and an imperial guard ) are for the wife's red focus.

What could be simpler.