I had some left over lace weight and a skein of natural mohair. I had Kid Silk Haze and Mayhem & chaos Angel, these 2 lace weights were different intensities of the same colour so I knitted a simple reversible scarf holding them together with a 12ply natural mohair. This gave a nice mottled result:
I wrote up the pattern. It is a quick knit on 8mm needles with 4 rows in the pattern. You can find it here.