Knitting Stripes

I am brainstorming longies or a skirty with legs for my friend who is due in September and she mentioned in passing that she loves big thick stripes. I haven't ever done stripes and just wondering if it's pretty easy? How do you join the different colors? Any other feedback is greatly appreciated! :)

I twist them up like if I were alternating skeins, so I don't have to weave ends at each switch. There is a way to do joggless stripes too. I can't really explain it, but there are some good tuts online. It involves knitting into the color below to reduce the step you get when switching colors in the round.

I'd definitely carry/twist the yarn like Sam said - if you break the yarn after each stripe you're going to have a heck of a lot of ends to weave in.  You just have to be careful with your tension - if you pull too tight when you twist it will kind of pull the fabric along the line where you're carrying the yarn.  So taught but not too tight (you'll get the feel for it as you work).