Crochet is definitely a cousin to knitting. It is a great skill to have in your toolbox. If you don't know how to crochet, BellaOnline has a Crochet Site with some information to get started.
Crochet can be used in knitting for a variety of things from stiffening seams and necklines to adding flowers. To stiffen a neckline a row of chains stitches is added:
Crocheting the edges of a knitted garment may be just the thing needed to finish your project off. There is a lovely simple edging called crab stitch, that is just a reverse single crochet.
Using crochet you can add embellishments like flowers, leaves, or other shapes. Nicky Epstein has books full of ideas, crocheted embellishments, and crocheted edges. They offer many opportunities to be creative. For example:
Knowing how to crochet also allows you work a provisional cast on. A provisional cast on is worked with waste yarn that is removed to leave you with live stitches therefore allowing you to add an edging after you have knit the body.
One thing to keep in mind about crochet is that a crochet stitch is twice as thick as a knit stitch so you will use more yarn. Because of the density you may have to play around with it, use the gauge swatch I know you have, and see how it lays, looks and feels.
Crochet adds a different look to your knitting, but it is a helpful skill to have because you never know when you will need it.