I have collected a variety of amazingly wonderful skeins of yarn that are variegated. ....just one skein.  Here is a listing of patterns that call for two or three or four colors that are perfect for using one skein of variegated:  

On the Spice Market by Melanie Berg:

This version calls for only three colors.  Melanie's original pattern called for more.  But the lady who made the one below called it My Corona and I have a photo that names her on another blog post.  The three colors below are an orange, a tan and a variegated.  REALLY pretty!