My Roommate's Pillow Is Covered In Doodles...

So my roommate has this weird habit where she doodles on everything in our room. It's like a game of 'find the hidden drawing' every time I walk into our space. But lately, her pillowcases have become the canvas for her artistic fits, and it’s getting kind of out of hand... Every morning when I wake up, I can’t help but look at all these random stick figures or hearts with arrows pointing to them. It’s not like she’s going to wear them forever, right? But every time I bring it up, she just smiles and says they’re 'decorative.' Is that normal roommate behavior? Or am I the only one who finds this a bit... excessive? Anyone else had a similar issue with their roommates?