WOW....not sure where you are on your quilting journey but there are many sites with free patterns that would work very well for those color choices. I would just browse through them and find a pattern that you would be comfortable making remembering that you could add a color or print that would work beautifully with what you already have. Never feel limited by any color or pattern combination as long as you are happy with it. There are no rules in what you should or should not do other than it is pleasing to yourself.