They're all different with different squares. I bought my book on stitchesmarket.com, i guess because it was less expensive than other sites - it's been a couple of months.
I'm on my second square of The Great American Afghan (the one that has dark greens, tans, browns, reds). The book is really nice and was well worth the $12.95. I happened to like the colors, so I went with this one, but in the book, it also offers other suggestions for color families you can use instead of what the original pattern calls for. I also really liked the squares of The Great American Aran Afghan, but I didn't want to do it all white; what i realized later was that I could still have done it, but used a different color for each square, but that would have taken too much thinking and obsessing on my part; the Great American... is probably better for me in that respect.