Comfort Aghans is a lovely book, filled with over 50 afghan patterns. Roughly half are knit and half are crocheted. The vast majority are written for worsted weight yarn; the remainder are split between DK and chunky gauge. You'll find just about every style under the sun, from traditional stripes to more understated textural patterns; interesting variations on afghans made of squares; modular knitting & creative crochet shapes; embroidery, colorwork, cables and more. There are a few styles specifically shown as baby blankets (although making other patterns in traditional baby colors would easily work) but most of the choices are shown on couches, chairs or other non-baby settings. There are lots of clear, beautiful photographs; charts are provided where necessary; and the skill level ranges from afghan to afghan (some are suitable for beginner knitters or crocheters while others employ more advanced skills). If you do the math, this book is a wonderful value: at the current Amazon price, patterns cost on average less than thirty cents each. And there is nothing about this book as opposed to any other book that would make it difficult to substitute yarns if you didn't wish to use the Berroco yarns shown in the book. At around three bucks a ball for Comfort DK, for example, I don't think the Berroco yarns are exceptionally pricey in the larger scheme of things, but given that afghans provide great flexibility in size/gauge (they don't need to fit precise measurements in the way that, say, a sweater does), and given that most of the book uses worsted weight Comfort -- one of the most readily available gauges available -- it would be a cinch to substitute whatever worsted yarn you prefer, from Red Heart to Malabrigo.
All in all, a lovely book with tons of patterns that run the gamut when it comes to style, technique and skill level.