I've found myself bitten by the Gradient Set bug!!
There are so many great color combinations and so many beautiful patterns to use these wonderful kits with.
Skeins: Six, 125-yard skeins
Yarn: Merino/Cashmere/Nylon - 80/10/10 Fingering Weight
Gauge: 7-9 Stitches per inch on US needles size 1-3
Care: I would steam block your garment; however using a COLD water bath would be fine as well.
If you are looking for patterns to use the kits in, here are a few:
On The Spice Market
Joker and The Thief