I knitted a pair of felted shoes for my girlfriend:
I used size 12 needles and blue felt wool. After knitting i threw them in the washing machine with a few tennis balls to shrink them to the correct size!
As my girlfriend has always cold feet I added an inductive coil in the outsole, when she puts her feet on the small wooden platforms (which are connected to a power supply) the shoes are heated from the inside:-)
I've created a detailed explanation on how I created them on instructables.
Merry christmas everyone:-)