On second thought
Well, after claiming that I would need to use the pink or orange yarn and after an overwhelming majority suggested the pink, as the best option, I went with...
...mint green.
Once I completed the brown portion of the garment, with most of the 4th ball left, I realized that the two balls of mint green should be just enough. I really like the pink yarn, but I'm going to use it for something different.
I knit and reknit the green portion, a few times to get just the right effect.
When I was finally happy with the results, I debated doing the straps in brown, but decided green, with brown trim would be better. After three days of obsessing over the piece, the knitting and crochet are done.
The sun poked her little head out today, so I decided to get some shots while the shooting's good. The piece is just lousy with unwoven ends, right now, but the nice thing about having a mannequin is that I can easily tuck them away, and she won't move around and set those ends loose.
So here it is, all done, but for the weaving.
I don't think I'll keep that particular ribbon at the bust, I'll swap it out for something simpler, but I wanted something there to complete the look.
Here's a back view and a view of how I'll most likely wear it; layered under a jacket. If I had more yardage, I think I would have done short little flutter sleeves, terminating in the same lace as the hem, but a tank is nice too.