Heliophanus lineiventris jumping spiders have white markings on their legs and body that make it look like they’re wearing a skeleton suit on their exoskeleton: https://www.inaturalist.org/observations/11145686
Apparently in some regions of the USA mantids are colloquially known as devil’s horses.
The magnolia fruit I came across last month also looked suitably spooky in a ‘the trees are watching me’ sense:
