craftgrrl | Knitting/crochet question (Reply)

I have a possibly stupid knitting question*:
If you knit across all rows and never purl, then it becomes the stockinette stich and it curls inwards towards the wrong side, yes? This is my actual question - I've done a crochet border around a stockinette knit piece and had success with that helping it lay flat, but if you want to only knit I was wondering if you begin and end every single row with a purl stitch, will it create a little border that will help the whole thing lie flat? Would it be an attractive border? Is this a bad idea or am I being master of the obvious and this is a basic trick everyone knows already? If this works, I think it should work with the Knifty Knitter as well.

Here are a couple of really simple projects I've done in the past few of weeks

crochet ipod cozies.

They look much better with an ipod actually in them. 6 of my friends all got new shiney black video ipods, so I wanted to make them something they could use for them. The boys got a grey border and the girls got a black border. Each has a little silver charm on the bottom

You know how kitties just looooove to sit on things they're not supposed to sit on? I took that concept and ran with it, knitting my ball of fluff something that'd feel like my favourite sweater which she just loves to shed all over. Ironically, she liked to sleep on it while it was still on the Knifty Knitter loom.

I crochet a grey border around it to keep it from curling under, as the KK produces stockinette stich. I know I didn't do the corners entirely right [I just winged it {wung it?} and added a chain stitch here and there to get it around the curve, but I don't know how you're really supposed to do this.] The important thing is, I think she likes it.

*I am recently self taught at crochet and want to get into knitting now. I've tried nothing fancy in either as of yet! Please bear with me ;)

EDIT: Got it. Stockinette is knit one row, purl the next. pardon the mistake.