Lester Laminack's book Saturdays and Teacakes, provides EXCELLENT examples of qualities of good writing to use during mini lessons in Writer's Workshop. This book great examples all wrapped up in one place. It's fantastic! Every year, my students and I make an anchor chart that lists the qualities of good writing as well as examples from the text. They often refer back to this chart as they are looking for ideas to make their writing stronger throughout the year.