Replying to Dying Snowpants

So along with about two to three thousand other kids, I have burton 2L pants, baby blue and green. They're great snowpants, because i'm super tall and skinny, and the suspenders have totally eliminated the need for a belt. Only problem is, I hate the color, and the way they look, because everyone and their sister has them. So lets get to the meat of this thread: I'm going to dye my snow pants, and I want to die them all black. I've searched around a bit for a solution, and happened upon dispersion dying. Since the pants are 100% polyester, other dying methods would prove useless when pitted against polyester. I found a site that helped me out a lot with what I'm trying to do.
 
http://www.pburch.net/dyeing/dispersedye.shtml

My main question is, has anyone successfully done this before. My plan is to dye the pants all black, and put something between fabric and paper to create a design on the pants using the blue sections. If anyone has done this, I'm interested to see how it turned out, and what methods were used. If not, I'll be posting pictures to show how it went. 
Peace!