Yes, this is an animal. The Spanish dancer (Hexabranchus sanguineus - meaning "blood-colored six-gills") is a dorid nudibranch (sea slug). I think it's great color and design inspiration for a crocheted afghan.
Larval Leaf Scorpionfish (photograph by Chris Newbert, Minden Pictures). Lacking any other defense, many larval fish have adapted transparency as a method of camouflage—such as this tiny, see-through larval leaf scorpionfish in Hawaii.
i didn't type this: Rare Glowing Flower Hat Jellyfish (Osaka Aquarium, Japan.) When it's not using its long, pink tipped tentacles, it will curl them upwards towards its pin-striped bell to sit and wait until some kind of prey comes along.