For PC's birthday, I did some secret knitting and made him two golf club socks in his favourite colours: green and orange for the Irish flag. For the green colour, I used Manos del Uruguay silk blend #3204 and for the orange, Noro Cash Iroha #116 Lot E. I'm not sure that these are available on their websites, but you can get them from other online yarn stores. I got mine from Wildfiber in Santa Monica. The pattern I used is from Purl Bee. There are supposed to be 3 in the set but I haven't got round to knitting the driver yet (the biggest). I also still need to weave in the ends of first two. I'm running out of the green yarn, so I will need to buy one more skein and possibly another skein of orange, but I won't know until I start knitting.
See below for more images and link to pattern.