If you alternate knit and purl rows you can do cool rolly things!
Speaking of which, I'm going to be knitting some kitty collars like they have in SSSS for me and my friends (the cats, not us ) and I was wondering what method of switching colored yarns would be best for a thin line around the edges? I'm still VERY inexperienced with knitting but I can knit and purl just fine? Noob question, sorry :0
I suggest doing an i-cord edging, which gives a very finished look. Here's a video explaining how add it last to your finished piece.
Although most people believe you need double-pointed needles to make i-cord, if you follow how she passes her stitches back to the left-hand needle, you can easily do this with regular needles. Just remember to go down two needle sizes, otherwise the icord can look kinda floppy.
You could also add a crochet edge if you know how to crochet, but it is not going to be quite as smooth.