
I finally have taken a picture of the yarn choices I have:
Bernat Super Value in Navy Blue
TLC Essentials in country blue
RHSS in Buff
TLC Essentials in Aran
I'm not sure about the buff... should I do four colors with it, or do three colors with just the other options? I'm not sure how easily I can obtain the buff- I haven't seen it around here in a while.
Also, my book has arrived!!!! I went through all of the squares, and for layout purposes, I figured this out:
There are exactly 32 bi-colored squares, 8 each of the D1-L1 D1-L2 D2-L1 D2-L2 (D=Dark, L=Light). There are 15 squares of one light, and 16 of the other. If you're doing diagonal rows, that means that the bicolored squares have to be on each outside corner.
I'm playing around in PSP now to see what I like for layout options, if I want to include the buff or not.
Now that I've played around a little, I'm thinking I like it better with the buff in there. The dark navy squares are the bicolored when it's only three colors. The dark navy and the light blue are the bicolored squares when there are four colors. What do you think?

OK, I've finally decided on four colors. I've examined my yarn carefully and I think there will be enough contrast between the country blue and the buff. I've also narrowed it down to one of the first two options, plus a third new one for my layout.