Don't worry too much about the extra yarn, I still have plenty of the grey and white and I managed to get 15 extra balls blue that are a closer color than the new delivery. Some are even of the same dye lot! So I'm sure there will be no problems at all.
This morning I will start on the roses border and I intend -stubborn as I am :) - to knit it in completely, we'll see how it goes. As soon as it's finished, I will post a picture of course.
I'm very happy with the way the sweater is going to look, it's even better than I expected!