I have seen around.... at shows and on the bags of various knitters ... these adorable little mini-swatch pins -- almost like you began knitting an itsy-bitsy tiny square, then left it on the needles.
Well, this morning I was checking out Ravelry (if you STILL haven't signed up, you simply must do so! For knitters and crocheters, it is the COOLEST resource/network EVER!) and saw an add for a shop called "Mi-KNIT-ures." Click on the link and what do I find? The adorable little pins, of course!! They are so cute, and come in a variety of colors! What a neat stocking-stuffer idea for the knitter in your life! Or yourself! Or both!! :)