It's possible. The only thing I'm not sure of is that you only have two darks (the darkest brown and the wine), and they're not as close to each other in either hue or value to give you any "dark continuity" - whereas your mediums are all very similar in value (and not too far off in hue). You'll have good continuity of color/hue in lights and mediums, but not in darks. I think the darks will look like 'splotches' of this and that and you'll lose the overall effect.
If you stuck to using just one of the darks it might work.
Also wondering if you should add one more light in between the gold and the cream to lend just a little more continuity to the lights as well.
But by all means, throw the greens and blues in with the tans in the medium spectrum for the scrappy look that you want. Just not sure if that will be scrappy enough for you.
Good luck - let us know what you do!