The Bunny from the pictures is made using Himalaya Dolphin Baby yarn (over half of a skein) and a 4.0mm size hook, but you can make it with any materials you want. If you use thinner yarn, it can be a really cute keychain. My plushie, made with mentioned materials is about 25cm (10 inches) high (with ears).
The pattern is almost seamless – you will sew only head to the body.
The pattern is meant for the beginners and intermediate crocheters.