When you drag in a screenshot, Rotato works in the background to extract the most significant colors from that screenshot. Once it's done, you can select from these colors in the side bar.
Rotato comes with a clay mode for all devices. Enabling it changes all of the materials on the selected device to a clay-like material, without reflections. This is a great effect when you want to direct a viewer's attention away from the device, but still show your design on a device.
You can change the shadow intensity. The higher the number, the more intense.