Slöjd-style carving. You can really do a lot with just a few simple tools, a knife, an axe and a saw.

Morakniv has an excellent series of different knife-grips/cuts on their youtubechannel here

The thing I like most about it is since you are just carving with a knife, you get big shavings of wood that you can easily sweep up, instead of wooddust all over the place.