Eternal Evil got trading cards!
If you've played the game you can find EE trading cards in your Steam Profile Inventory.
Also by going to Steam's The Points Shop, if you filter by game, type in Eternal Evil, under Backgrounds category you can find 3 backgrounds for your profile in Eternal Evil theme.
You can get to The Points Shop by going to your Profile on Steam, then Edit Profile, and there you should be able to find The Points Shop.