Make all Rabbits in the world have a percentage chance of spawning as elite, and make the difficulty of them identical to elite sabertooths. THAT would be an unexpected tough and lol fight all at once. Give them loot tables similar to elites, maybe some more sweeteners and a slightly higher percentage, and boom!
All you need to do is get an artist to give them glowy eyes then play with the stats! Easter is go!
It wouldn’t be too hard, but it wouldn’t exactly be easy - there’d be a fairly hefty bit of animation work to be done for it as there isn’t exactly anything in the game now that would allow one to rig an oversized rabbit to the skeleton and use the animations.
Have the elite rabbits drop red easter eggs, which hatch baby easter rabbits, who drop blue easter eggs when in a pen, which when opened will yield surprises.