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I think that in simple terms, what you need is not to fill with color picker, but rather to fill the vector with a full color pattern fill, or with a bitmap pattern fill. For that last:
1. Create a bitmap image with a solid coloring. It can be a TIF, JPG, BMP, or GIF file.
2. Use it as the fill for the vector.
is the outline of the process.
Perhaps that would give you more consistent results with e.g. your Bing logo. But maybe there's something about the Bing logo that is making the process of a fill inconvenient and inconsistent in results... if you could post me the Bing logo in question, I could judge as to that.