Two-Color Brioche

Brioche Stitch in Two Colors in Knitting. It is not terribly difficult and makes for a wonderfully smooshy fabric.

Seafoam

Seafoam Drop Stitch Pattern. It is fun and easy to make, and looks beautiful in a variegated yarn.

Fretwork

Fretwork Mosaic Knitting. This is a good first pattern for trying color work and slipped stitches.