For me, I think it depends on the look you want.
1. If going for the mixed look, then I would mix in many colors and not just the pinks and a couple blues. The blues look out of place .
2. I think it is a very attractive block if you just go with alternating the pinks: pink background/white flowers, white background/pink flowers, etc. It has that delicate soft look with not a lot of contrast. You can do that with each block in a different color scheme.
3. For high contrast, then go with something more along the lines of the mauve and blue combination, but then do that with each square for more consistency. You can use lots of different combinations.
For me, and IMHO, what throws things off, is when it's all combined in one block and I can't read what the intention is.