My second cousin had a Bar Mitzvah recently, and I thought I'd knit him something nice, since I couldn't make it up to MA to be there (the fact that it was the same weekend as the Maryland sheep and wool festival is coincidence! Pure coincidence. But really, I did have some other things to do). I doubt most 13 year old boys are wishing and hoping for knit yarmulkes from their cousins, so I graciously included a gift certificate to an ice cream store as well. I even carefully wrote down exactly what I did, and lost the piece of paper. I'll knit another one soon to clear it up and post the recipe. Thanks very much to my gentile model, Eriq of Go-Adventure Sports (check out his website if you're ever in the DC area with a hankering to go climbing or caving).
*Note: There are some kosher rules governing the types of fabric one may wear, so be a bit careful. As far as I can tell, the only actual prohibition is on wool-linen blends. I had never heard of this, but I suspect some people might be unwilling to wear a yarmulke containing a wool-linen blend.