This hat is from Hattitude.
I knitted it for the younger son of the friend who is modelling it. He's at university, and loves bright, different things.
The pattern is called "whirlygig" [I think]. In the book it is knitted in two contrasting colours, but I knitted the main hat in black, then used all my other "stash" balls of yarn for the I-cords. There are 18, and I just had 18 different coloured balls of yarn in my "stash".
I was made in double knitting yarn, on 4.5mm dpns and a 40 cm circular needle.
And , yes! It was a lot of fun to knit.