Kawaii Amigurumi Mushroom
This free pattern from Anitha Domacin at A Little Love Everyday is about as sweet as amigurumi gets. The bright red cap with its little white spots sits on a chubby cream body, and the tiny embroidered smile gives it that classic kawaii face you'll want to make over and over. The whole thing is worked from the top down, so the cap and body flow right into each other.
It uses sport weight cotton and a 2mm hook, which keeps the stitches tight and the fabric crisp, and the finished mushroom comes out small enough to sit in your palm. It's a quick make, so most crocheters can finish one in an evening.