Colorschemes

You can choose a custom colorscheme as a reference to your project. Tap the colorscheme bar to bring up the colorscheme picker. By default you can move all color dots as you like to choose your color. Moving the dot in the middle makes the color less saturated. You can change the brightness of the color by taping on the desired dot and moving the slider beneath.
If you like you can use one of the automatic color harmonies. To change the harmony mode, just tap with 2 fingers on the color wheel. Douple-tap with one finger to randomize the current color scheme.