I've tried this a few times and have failed miserably. A friend of mine told me the more strobes I use at lower power, the better, but i have never been able to get anything close to what you have. The milk part is very creative on your part because of the viscocity of the milk vs. food colored water. I really like these, and in some, I wish you had expanded the whole color throughout the whole frame. For instance:
This is my favorite one, and i see you have a closer one right above it, but I liked the zoomed out feel of this one, but if it was a sea of red rather than the 2 colors, it may look better. I say may because you just never know if it actually will look better.