In the white parts I found a great machine quilting motif in '60 Machine Quilting Patterns' by Pat Holly and Sue Nickels. Looks really good, but is very easy - just my kind of deal!
You do the centre small petals first, then the bigger ones and then add the three part leaf at the end. Here is my effort. I didn't mark the whole thing, just measured from the centre of each square where the tops of the small and large petals would go, marked it in red washable pencil and then went for it. The beauty of this method is that since no two flowers are exactly the same, they all look great! Well, I think so!