Heather found this listing. Tum-te-tum, just a perfectly normal room, nothing to see here, nothing at all.
Move along folks, no reason for you to be thinking of crime scenes... I'm sure there are plenty of kids' games that involve flash cards like these:
Children's games like Find The Bullet Fragment and Blood Splatter, Blood Splatter, Who's Got the Blood Splatter! Or my kids' favorite, Pass the Possible Murder Weapon. Ah, sweet childhood.