Wool and Sticks
And some sticks with a wee hook carved into them
Can make things like these:
Wool in top pictures and hat is this from Ice Yarns. Its nice. The very dark brown is nicer. The hat pattern is my own.
The bamboo hooks are from here. And although they aren't my beloved Bates silvalume hooks from the US, they are mighty fine (and sharp - a rarity in hooks avilable in the UK).
The gladiator sandals pattern is from here. The wool is Alpaca Love by Stitch Nation.