Sometimes a plain piece of knit or crochet can be transformed by a beautiful border. The book Around the Corner: Crochet Borders by Edie Eckman shows how to join yarn to both knit and crochet pieces and figure out the correct number of stitches for straight places, corners, and curves. A short section shows how to add crochet to woven cloth.
150 crocheted edging patterns go from simple to fancy with suggestions on color choices to make your work absolutely stunning.
I recommend this book for crocheters and for knitters who crochet enough to make finished edges.