Color concepts

I am intrigued by color and more so with the way I paint with it. I like contrast. On this cup, I used blue with white. Hard to see but the paint ran and left swirls of various blues and the white shows up so strong.

Then I did this cup with blue and yellow. Again I really love the contrast. I feel it is Van Gogh like. The yellow spots stands out like the irises in Van Gogh's painting. I guess that is something I did not plan but really like how it turned out.

Then I painted this journal cover. I like contrasts in the colors of the blues, greens, and reds. This design gives me a feeling of motion. The swirls of color are like the breeze the butterflies are drifting on. How do you like to paint? Monochromatic, contrast, or blends??