Daedra Hearts aren't just for gold and health potions anymore.
Crafted by Benjamin Ng Tang of Black Steel Props (via r/skyrim), this polyutherane foam Daedra Heart stress ball makes "an awesome gift to anyone who is a fan of Skyrim or Elder Scrolls Online." He also notes that it's very fun to throw at people, but I think I'd just stick to squeezing, personally.
They're $US25 a pop at Tang's Etsy shop, in case you're interested in one. If not, here's a couple more photos (with a shot of an "actual" Daedra Heart, just for comparison's sake):
Daedra Heart shot via the UESP