The idea is you choose a yarn and a pattern for your partner and then you rewind the ball and while doing that you include little treats and gifts in the ball so that as you knit the gifts fall out. It's a great idea and really keeps you knitting so that you can find out what the next treat is.
The yarn I was gifted was a knit picks yarn and lovely to work with and the pattern was charade socks. There were plenty of gifts in my ball but the best was the cow ear muffs.
If the group organises this swap again I'll certainly be signing up as it was great fun.