I LOVE the colors that I used for this and think they're perfect together. The black/dark green as a contrast is subtle but stands out well in the light. I'm totally thinking about making it again, just reversing the colors this time. I should have more than enough yarn left from the original skeins.
I learned how to knit jogless stripes with this hat, which is a method that helps to make the changes in colors along the seam less noticeable (or "virtually invisible" as Jared Flood puts it).
This was knit for Lenny (good job on picking the colors, Lenny!) and he's been wearing it a lot since. It fits him well and looks good, if I do say so myself.
Yarn:
Cascade 220 (100% Peruvian Highland Wool)
100g/220 yd skeins
1 partial skein Black (8555)
1 partial skein Avocado Tweed (9413)
Needles:
US5 (3.75mm) 16" circular needle
US7 (4.5mm) 16" circular needle