Last year for the Tour de Fleece I created special colour way for Team Flossy (Hilltop Cloud). It was a Gradient Pack called Cobblestones, inspired by the minted colours you get on set stones when they're used as a road surface.
The general look of the colour way was muted grey, but with a bit of a rainbow lurking underneath.
I had 3 packs, and spun the yarn in to a 2 ply fingering weight. Two packs I plyed with each other to make one large gradient skein (actually 2 skiens as 280g is too large to wind on a niddy noddy). The 3rd pack I split in to quarters, and spun it in to 2 matching shorter skeins, each containing half a pack.
The big skeins were for the body of a jumper, and the shorter skeins were for matching sleeves.
The end result is a gradient jumper, with matching long sleeves. Isn't being a hand spinner useful at times!
The original pattern (Sugar Maple) uses cap sleeves so that you don't have to worry about matching sleeves when using hand dyed yarn. It's a top down pattern so I put the stitches on holders instead of casting off, and then joined in my sleeve skeins. I used up every last bit of the yarn for the sleeves, but I didn't use all of the body yarn as it was getting a bit long.
My Ravelry project page can be found here- http://www.ravelry.com/projects/hilltopkatie/sugar-maple-2