As if we couldn't get enough of Killer Bunnies, getting 55 new cards with every booster pack, I started designing some of my own on blank cards.
A cat in bunny costume! It doesn't go onto the bunny pile after discarding and it can't be used to win the game, because when getting examined closer it reveals to be a fake bunny. It can be harmed by weapons and has to be fed because as part of the disguise it will hide cabbage and water behind its back.
A Play Immediately card that kills nearly all of the bunnies in the Bunny Circle. Really nasty one!
And a nice Play Immediately card. :)