I think those colors will make a great quilt. I don't think it's the colors so much as the tones and shades of the colors that make them go together or not. One thing I love about florals is that so many colors go together so beautifully!
I'd look for a print that will pull your colors together and work from that. There are many ways to mix colors, and there have already been some wonderful suggestions. The D9P is my go to pattern, especially the Scattered D9P, for blending a lot of colors.