Easy Street mystery: Week 4

I wasn't in love with these when I first finished them, because the colors seemed to be blending together too much. Now that I have looked at them in actual sunlight, however, they're not so bad. I like the dark, swampy colors...I keep (mentally) using the word "murky" to describe what I'm going for. I need to pick my third color at this point, though; I haven't yet cut those squares for the fourth week. What should I use? Golds? Oranges? Chocolate browns? Maybe even (gulp) smoky blues?

Erratum: In my haste to calculate percentages, I was a little off last week because I failed to consider the half-square size of the flying geese. I think the correct figure is that we have now assembled or cut 66% of the units for this quilt. (for those of you who like the numbers...LOL!)