Once I wanted to have a really big crochet hook and knitting needles and after I found tutorials on how to make them (see links below), I made myself some.
In fact they are so big that it is quite difficult to work with them ;-)
I use them very rarely – but if necessary, I can ;-)
Links:
Making Crochet Hooks:
Making Crochet Hooks from Chopsticks (with explaining pictures)
Make your own straight hook (with explaining pictures)
Making Knitting Needles:
Chopstick/dowel knitting needle tutorial