It's a niche area. But sometimes the C word is the only way of getting your point across.
If you know someone who's a proper cunt, here are a few cards that might be right up their euphemistic alley (click on any pic to buy it from our shop
And finally, if you're feeling continental, say it in (terribly translated) French:
Get 'em in our spanky new shop and call someone you love a cunt today.