We both chose to use teal and grey fabric dye from Micheal's by following the directions on the package but also adding a little vinegar because we were using lighter fabrics. I finished my edges with a zig-zag stitch and faded from dark grey to dark teal lengthwise. Amy left her edges as is and faded from dark grey to dark teal widthwise. The darker colors were achieved by letting some parts sit in the dye longer than the rest.
I hate to admit it, but I think my sisters turned out slightly better than mine. However, they both turned out well and are completely wearable.