Crochet Jellyfish
This jellyfish from ChiWei at One Dog Woof is the kind of project you start in the morning and finish before bed. The rounded head is worked in continuous rounds, and the magic really happens with the eight curly tentacles that spiral out underneath. Each one is a long chain worked with extra stitches into every chain stitch, which is what gives them their springy, twisty shape.
The finished jellyfish runs about 15 inches long depending on how long you make the streamers, and most makers wrap it up in roughly half a day. It uses cotton worsted yarn and a G or H hook, so the fabric stays soft enough to squish but firm enough to hold its shape.