Your knitting doesn't have to be a solid color. Try knitting with two colors, or 60! Palette comes in 83 colors! Try incorporating stripes, Fair Isle, or intarsia into your next knitting project for a pop of color.
Fair Isle is a traditional knitting technique where you knit with two colors at a time. The color that is not being used is stranded across the back side of your work. This video tutorial will show you how to alternate colors in a stranded knitting pattern.
Intarsia The closest knitting gets to painting. You can create pictures in your knitting by using multiple pieces of yarn for each colored section in your design.
Stripes A simple way to incorporate lots of color into a knitting project. You can also add stripes to Fair Isle or intarsia designs for even more complexity and interest.
Mary Scott Huff, author of The New Stranded Colorwork, talks about tips and tricks for stranded knitting.
Steeking Many colorwork sweaters require steeks, to create holes for the arms, head, or turn the pullover into a cardigan. Steeking is just a method of sewing a reinforcement over your knitted stitches before you cut them.