Dyeing Prefolds

I have a ton of prefolds (well not a ton but several) that I'm going to try to dye this weekend (after we're done moving) and I am going to try to make them as bright as possible. I'll post pics to show how I do. I've been wondering about getting some white wool and dying it, to make a pair of longies for Norrah...(I'm not the best knitter HARDLY, I've just started, but I still want to try.) I wonder if I'd dye it the same way or if there is something special that I'd have to do. Hmmm...off to search it and see what I can find.