I'm not a kitty person, but I have a horrible doggy story.
When I first got my dog, he didn't like to be left alone in the house. Every time we came home he'd have something else torn to bits (luckily he's outgrown this stage).
One day we came home and saw blue paw prints all over the kitchen floor. My first reaction was, "Oh sh!t! How much is this going to cost me?" I then called for Scruff, and he happily bounced into the kitchen with a big smile on his mug.
Yep, his mouth, paws, and legs were all covered in blue ink. I didn't even want to know where the pen was located, but I looked for it anyway.
I strolled into the living room and saw it lying there, in a smug, bent-up position, right in the middle of the carpet. I had no idea that one little pen could produce that much ink! There was an area about 2 ft. in diameter that was nicely stained.
Luckily it was concentrated in one spot so an area rug covered it well. Scruff, on the other hand, remained blue for two weeks. I finally had to break down and shave it off.
I've since designated one specific drawer in my home for all ink pens.