Tutorial for Horizontal Flows 015, 017, 019, 021
Gradients, patterns, and pictures can be added as fills from the "Fill Effects" menu. Gradients, when carefully used, can also add motion to a flow such this.
The bars can be on the page without animation. Then the animation of flows can be brought in one after the other as wipes, peak in, crawl in, fly in, etc. from the left or right to show a build and to enhance the effect of the flow. Another alternative might be as shown in the example for this series.